Working Backwards Finding Circumference From Area.

the steps for finding Area if we are given the circumference The missing information for solving for the area of a circle is always radius, because Pi is always 3.14 Where do we get our radius? So, what if we start with the Area? If we have the area, and we need/find to solve for? We need the Diameter to find circumference, so to find the diameter if we are given Area, we have to work backwards from the area, and find the specific radius. This is harder than it seems. What might be a problem in solving this?/

Warm-Up Find the area and circumference of a circle with radius r = 4.

Warm-Up Find the area and circumference of a circle with radius r = 4. Geometry 11-1 Lines of Circles Definitions Example Identify each line or segment that intersects  P. chords: secant: tangent: diameter: radii: QR and ST ST PQ, PT, and PS UV ST Definition A common tangent is a line that is tangent to two circles. Theorem 1 If a line is tangent to a/

CSE 143 Lecture 20 Abstract classes. 2 Circle public class Circle { private double radius; public Circle(double radius) { this.radius = radius; } public.

toString() in abstract superclass: public abstract class Shape implements Comparable { private String name; public Shape(String name) { this.name = name; } public abstract double area(); public int compareTo(Shape other) {... } public String toString() { return name + " of area " + area(); } } 22 New constructors public Circle(double radius) { super("cicle"); this.radius = radius; } public Rectangle(double length, double width) { super("rectangle"); this.length = length; this.width = width; } public Square/

What do you see?. What do What do you see? Is the left center circle bigger?

center circle bigger? Keep staring at the black dot. After a while the gray haze around it will appear to shrink. Can you find the dog? Stare at the black light bulb for at least 30 seconds. Then immediately stare at a white area on the screen or at a sheet of /What do you see on the left? What do you see on the right? Stare at the blue circles and move your head back and forth from the screen. Do the outer circles move? Can you believe that this is a picture and not an animation? To check, just focus on/

CIS3023: Programming Fundamentals for CIS Majors II Summer 2010 Ganesh Viswanathan Abstract Classes Course Lecture Slides 7 June 2010 “None of the abstract.

= new Rectangle(5, 3); Rectangle r2 = new Rectangle(3, 3); System.out.println(“c and r1 have equal area: " + equalArea(c, r1)); System.out.println(“r1 and r2 have equal area: " + equalArea(r1, r2)); } // what should the definition of equalArea() look like? public static boolean equalArea( Circle o1, Rectangle o2){ return o1.getArea() == o2.getArea(); } public static boolean equalArea( Rectangle o1, Rectangle o2){ return/

Circles & Gravity What the heck do they have to do with each other? Astro10/15/08 ©2007 Daryl Taylor

) »Died from a burst bladder! –Stayed up EVERY night of his life »Mapping the sky »Keeping data –Volumes & VOLUMES of data Intro Stuff (That means “boring stuff..”) Kepler? Kepler?/ means “boring stuff..”) 3 LAWS? [Block 4] 3 LAWS? [Block 4] –Ellipses –Equal Areas –K = T 2 / R 3 Math or Science? Math or Science? Video Clip!!! YIPPEE!!!/Law (Block 8) –Planets travel in ELLIPTICAL orbits, not circular. –Definitions »Circle – ‘r’ »Ellipse – ‘a+b’ –Why? Circle, duh… R Ellipse, F1F1 F2F2 Earth a b Real Stuff 2 nd /

MaxCell Installation Reports BSNL Kerala Circle, Trivendrum, India

26.4 % Remarks:- This trial was held in exchange compound because it required permission to open manhole and mainly because of coastal area and monsoon season all manhole were fill up with water. Formed a 100m lengthy 110-100 mm conduit, do sub-/ - India Sub- ducting via 40-33mm in 110-100mm conduit Date: 4 & 5th June 2010 End User: BSNL Kerala Circle，Trivendrum Installer: Milliken Venue: StachueTelephone Exchange, Trivendrum Classification: Overlay Sub- ducting via 40-33mm in 110-100mm conduit 18mm cable /

Invasion of the SpelioBots Semi-Autonomous Robotic Exploration of Martian Caves Dr. P. Boston & G. Frederick.

Getting her Daughter ready for School Getting her Daughter ready for School All of the Above All of the Above What is a Lava Tube? Image Courtesy Hawaiian Volcano Observatory Ancient/Circle Wind Direction A A 1. Circle 2. Fly to Predicted Radar Area Wind Direction A A 1. Circle 2. Fly to Predicted Radar Area 3. Fly Predicted Radar Area Wind Direction A A 1. Circle 2. Fly to Predicted Radar Area 3. Fly Predicted Radar Area 4. Fly to Next Radar Area Wind Direction A A 1. Circle 2. Fly to Predicted Radar Area/

1 Classes and Objects in Java Basics of Classes in Java.

Class Circle public class Circle { public double x, y; // centre of the circle public double r; // radius of circle //Methods to return circumference and area public double circumference() { return 2*3.14*r; } public double area() { return 3.14 * r * r; } Method Body 9 Data Abstraction Declare the Circle class, have created a new data type – Data Abstraction Can define variables (objects) of that type: Circle aCircle; Circle bCircle; 10 Class of Circle cont/

Venn Diagram Technique for testing syllogisms

, we diagram the first premise Next, we diagram the first premise. The premise states that all snakes are reptiles. We represent this information by shading the area of the Snakes circle that does not overlap with the Reptiles circle. Next, we diagram the second premise Next, we diagram the second premise. The second premise states that all reptiles are cold-blooded animals. We represent/

1 Circle Formulae 2 The area of a circle Tandi Clausen-May Click the mouse.

bits. Click the mouse Click to see Click the mouse 3 The area of a circle Tandi Clausen-May Click the mouse 4 We saw in Circle Formulae 1 that… Circumference =  × Diameter Now, what about the area? 5 Imagine a circle made out of strands of beads. Open it out. Click the mouse Click to see the circle open 6 circumference radius (half the diameter) Let’s watch that/

Introduction to circles Area examples Let’s investigate… Circumference Circumference examples Area of a circle The Circle www.mathsrevision.com.

234 567 8 ? ? ? ? ?? ? ? There is a much more accurate way! Mathematical Genius! www.mathsrevision.com Area of a circle A = r² Area = x radius There is a special formula for the area of a circle. Remember: r² means r x r Example 1 What is the area of this circle? A = r²A = x 4 x 4 Press Then x 4 x4 = A = 50.3m² (1 d.p.) 4m www/

This lecture is a bit of a departure in that we’ll cover how C++’s features are actually implemented. This implementation will look suspiciously similar.

calls it: Shape *sPtr = new Circle(); double a = sPtr->area(); So Circle::area is called, and passed an implicit this pointer: Circle::area(sPtr); // sPtr is implicitly passed // as “this” vtable ptr ptr to Circle::draw sPtr xCoord ptr to Shape::rotate yCoord ptr to Circle::area color ptr to Circle::circ... radius Circle::area can then do its thing, making use of Circle-specific data like radius: double Circle::area() { return PI * radius * radius; } Remember/

SUMMARY: abstract classes and interfaces 1 Make a class abstract so instances of it cannot be created. Make a method abstract so it must be overridden.

to write a sort procedure —many already exist. Avoid duplication of effort! Circle@x … area() … Circle Shape …Object b Rect@y … area() … Rect Shape …Object Trian@z … area() … Trian Shape …Object area() 0 1 2 3 4 … … Trian@z … area() … Trian Shape …Object area() Sort array of Shapes Solution: Write a function compareTo that tells whether one shape has bigger area than another. Tell sort procedure to use it. 16 Look/

GEOMETRY Circle Terminology.

Apothem The shortest distance between center point and chord Example: OA A Segment Area which bordered by arc and chord Shaded area is minor segment Plain area is major segment O Sector Area which bordered by two radii and an arc Shaded area is minor sector Plain area is major sector O Tangents of the circle Requirements:- Compass Pencils Eraser Scale Set Square Tangent Chord Secent If line/

Chapter 20- Virtual Functions and Polymorphism Associate Prof. Yuh-Shyan Chen Dept. of Computer Science and Information Engineering National Chung-Cheng.

? h : 0; } 137 138 double Cylinder::getHeight() { return height; } 139 140 double Cylinder::area() const 141 { 142 // surface area of Cylinder 143 return 2 * Circle::area() + 144 2 * 3.14159 * getRadius() * height; 145 } // end function area 146 147 double Cylinder::volume() const 148 { return Circle::area() * height; } 149 150 void Cylinder::print() const 151 { 152 Circle::print(); 153 cout << "; Height = " << height; 154 } // end function print 155 // Fig. 20.1/

EBlocks – Electronic Building Blocks for Sensor-Based Systems Frank Vahid Professor Dept. of Computer Science and Engineering University of California,

own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on/Frank Vahid, UC Riverside22/29 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two /

Java Lecture 2 John Black CS 425 Fall 2000. Classes and Objects We’ve already seen a number of examples public class Circle { public double x, y; // coordinates.

method, this is called “method overriding” –Method Overriding is not Variable Shadowing –We actually will often want to override methods (eg, a subclass computes area() differently than the Circle area() method) –Cannot use casting to access overridden methods Example of Method Overriding Consider this example: public class A { public f( ) {….} } public class B extends A{ public f( ) {….} } B b = new B( ); A a = b/

You Can Do It – eBlocks Enabling Regular People to Build Useful Customized Sensor-Based Systems Frank Vahid Professor Dept. of Computer Science and Engineering.

own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two blocks, click and drag from an output port (colored circle) to an input port (gray circle). A connection can be destroyed by clicking on/Frank Vahid, UC Riverside21/24 Graphical Simulator Welcome to the eBlocks Simulator! In this area, you’ll find helpful hints on creating your own designs. Click and drag an eBlock off of the “Available eBlocks” panel to add it to your design. To connect two /

The Origins of Dyops® The Dyop™ Revolution Allan Hytowitz Dyop® Vision Associates LLC Copyright©2015 – Dyop® Vision Associates – All Rights Reserved.

blurry with color distortion How big should the “Rotating Segmented Circles” be? Dyslexic Areas “Rotating Segmented Circles” Allan’s view with Single Vision Lenses Copyright©2015 – Dyop® Vision Associates – All Rights Reserved Inherent Dyslexic Vision Loss Astigmatic Area Dyslexic Area Dyslexic Areas caused blurry and distorted vision and almost four years of functional blindness Astigmatic Area Dyslexic Area Allan’s Problem Copyright©2015 – Dyop® Vision Associates – All Rights Reserved/

3.4 Area and Circumference 1 Circle A circle is a plane figure that consists of all points that lie the same distance from a fixed point. The fixed point.

= 14 ft. C = 3.14  14 =43.96 ft Answer: 87.92 ft Your Turn Problem #1 Find the circumference of a circle if the diameter is 28 ft. (Use 3.14 for  ) 3.4 Area and Circumference 4 Area Example 2. Find the Area of a circle if the radius is 7 ft. (Use 3.14 for  ) The formula is A =   r 2 or A =   r/

Welcome to AREA 51. Using Student Responders To respond to a question:  Wait for polling to open.  Select your response  You do not have to turn on.

Height? Formula chart ½Base Height (½ bh) Area of a Circle?1 Area of a Circle?2 Area of a Circle?3 Area of a Circle?4 Area of a Circle?5 RED: Half the circumference = Length ORANGE: Radius = Width Area of a Circle? RED: Half the circumference = Length ORANGE: Radius = Width Formula chart How Much Land is Wasted? Wasted Land Calculations Area of FarmSum of the Circle’s Areas Land NOT Used Percent of Farm NOT Used Farm Area 2.70 km 2 Farm NOT/

Introduction to circles Let’s investigate… Circumference Circumference examples The Circle.

out the circumference of each circle. C = d The Circumference Area of a circle To find the area we could try counting the squares inside the circle… 1 234 567 8 ? ? ? ? ?? ? ? There is a much more accurate way! Mathematical Genius! Area of a circle A = r² Area = x radius There is a special formula for the area of a circle. Remember: r² means r x r Example 1 What is the area of this circle? A = r/

Lesson 6-9 Pages 275-277 Geometry: Circles and Circumference (and Area) Lesson Check 6-8.

Lesson 6-9 Pages 275-277 Geometry: Circles and Circumference (and Area) Lesson Check 6-8 What you will learn! How to find the circumference of circles. CircleCenter Diameter Radius Circumference What you really need to know! A circle is the set of all points in a plane that are the same distance from a given / = 24.5 cm C = 2  r C = 2  3.14  24.5 C = 153.86 cm 49 cm Example 2: Find the area of a circle with a diameter of 49 centimeters. d = 49 cm r = 24.5 cm A =  rr A = 3.14 24.5 24.5 A = 1884.785 cm 2 /

Area, Circumference & Volume Objective: TLW a) Apply the given formula to find the area of a circle, the circumference of a circle, or the volume of a.

Objective: TLW a) Apply the given formula to find the area of a circle, the circumference of a circle, or the volume of a rectangular solid. Performance Indicator 9 Radius & Diameter Radius (r): the line HALFWAY through the circle Diameter (d): the line to the END of the circle radius diameter Radius & Diameter 5 ft. r =_____ d= ____ 3.2 m r =_____ d= ____ 6 ¼ cm r/

CSEB114: Principle of programming Tutorial 1. Question 1  You are required to design a program that will computes and displays a circle’s area and circumference,

circumference, given its radius. The program should repeatedly continue calculating and displaying the area and circumference until the user enter 0 for radius. Use pseudocode and flow chart. (Area=  r 2, Circumference=2  r) Answer  Problem Analysis  Input: radius  Output: area and circumference of a circle  Formula: Area=  r 2 Circumference=2  r  Constraint: none Answer  Pseudocode Begin Set pi = 3.14 Read radius, r Calculate/

7-6 Circles & Arcs 7-7 Area of Circles and Sectors.

7-6 Circles & Arcs 7-7 Area of Circles and Sectors Vocabulary Central Angle – angle whose vertex is the center of the circle

1 Classes and Objects in C++ 2 Introduction Java is a true OO language and therefore the underlying structure of all Java programs is classes. Anything.

Circle public class Circle { public double x, y; // centre of the circle public double r; // radius of circle //Methods to return circumference and area public double circumference() { return 2*3.14*r; } public double area() { return 3.14 * r * r; } Method Body / Method Definition 8 Data Abstraction Declare the Circle class, have created a new data type – Data Abstraction Can define variables (objects) of that type: Circle aCircle; Circle bCircle; 9 Class of Circle/

1 Classes and Objects in Java Basics of Classes in Java.

Class Circle public class Circle { public double x, y; // centre of the circle public double r; // radius of circle //Methods to return circumference and area public double circumference() { return 2*3.14*r; } public double area() { return 3.14 * r * r; } Method Body 7 Data Abstraction Declare the Circle class, have created a new data type – Data Abstraction Can define variables (objects) of that type: Circle aCircle; Circle bCircle; 8 Class of Circle cont/

1 Software Construction Lab 3 Classes and Objects in Java Basics of Classes in Java.

Class Circle public class Circle { public double x, y; // centre of the circle public double r; // radius of circle //Methods to return circumference and area public double circumference() { return 2*3.14*r; } public double area() { return 3.14 * r * r; } Method Body 8 Data Abstraction Declare the Circle class, have created a new data type – Data Abstraction Can define variables (objects) of that type: Circle aCircle; Circle bCircle; 9 Class of Circle cont/

SPI 6.4.4 I CAN identify parts of a circle. I CAN find the circumference and area of a circle.

SPI 6.4.4 I CAN identify parts of a circle. I CAN find the circumference and area of a circle. Circle – named from the center point. Radius – one endpoint at the center; the other endpoint on the circle Diameter – a segment that passes through the center and has both endpoints on the circle Chords – endpoints on the circle Central angle – an angle with its vertex at the center. Diameter/

Can other rectangles have the same area as this one?

visualize the rectangles. PerimeterLengthWidthArea 20 units7 units21 square units 20 units1 unit 20 units20 square units 20 units6 units 20 units8 units Quick Quiz Here are some rectangles with an area of 24 square units. Circle the rectangles with a perimeter greater than 24 units. Which rectangle has a larger perimeter? How much larger is that perimeter? Rectangle #1 Rectangle #2

CIRCLE Progress Monitoring Training 2015-16 School Year.

Training 2015-16 School Year CIRCLE Progress Monitoring Reporting o Completion Report: tracks completion of required assessments o Summary Report: allows districts and communities view children’s performance across all subject areas o Growth Report: allows districts, communities, and teachers to view children’s gains over time o Group Report: groups children with scores below age-related benchmarks and recommends activities for /

Circles When working with circles make sure you have the diameter and radius. Formulas Circumference = π * diameter C = πd Area = π * r 2 A = πr 2.

= 36π 3 units 2 Diameter = Radius = What is the area of the shaded region? 20cm 10cm A(square) = A(circle) = A (shaded) 20cm 20 * 20 = 400cm 2 πr 2 = π*(10) 2 = 100π = 314cm 2 = 400 - 314 = 86cm 2 What is the area of a circle that has a circumference of 94.2cm C = πd 94.2 = πd 94.2 = /d π d = 30cm r = 15cm A = πr 2 A = π(15) 2 A = 225π A = 706.5cm 2 What is the circumference of a circle that has an area of 452.16cm 2 C = πd C = π*24 C = 75.36cm d = 24cm r = 12cm A = πr 2 452.16 = πr 2 r 2 = 144cm /

Bell Work The 3 in the diagram represents 30 ft in real life. 3 in 2 in 1.5 in What is the scale for this blueprint What is the ACTUAL area of the bedroom.

life. 3 in 2 in 1.5 in What is the scale for this blueprint What is the ACTUAL area of the bedroom Bedroom Bathroom Hint: What type of polygon is the bathroom? Area & Circumference Objective: TLW a) Apply the given formula to find the area of a circle, the circumference of a circle, or the volume of a rectangular solid. Radius & Diameter Radius (r): the line HALFWAY through the/

CIRCLES CIRCUMFERENCE & AREA. CIRCUMFERENCE C = ΠdorC = 2Πr 12cm.

157 cm. What is the Radius? AREA: A = Πr 2 32cm AREA: A = Πr 2 4.2 ft AREA: A = Πr 2 R = ? The area of the following circle is 28.26 ft. What is the radius? AREA: A = Πr 2 R = ? The area of the following circle is 490.625 in. What is the radius? AREA: A = Πr 2 D = ? The area of the following circle is 78.5 cm. What is the/

Area of Circles Tiana Coley and Brianna Alexander.

Area of Circles Tiana Coley and Brianna Alexander Basic Rule Area of a circle is: pi*r 2, where ‘r’ is the radius And Pi= 3.14 r Problems with area In circle A, the length of line AT is 10cm, and the length of AB is 5cm. What is the area between the two circles? The question is asking us to identify the difference between the two circles; therefore, we need to subtract/

Circles Circumference and Area 6 th Grade Math LaVergne Middle School.

value is 3.14 or as an improper fraction is 22/7. Pi is an approximation. Circumference The circumference of a circle is the distance around a circle. Formula: C = πd C = 2πr 4 in. Area of a Circle The area of a circle is the number of square units needed to cover the inside of a circle. (Think of a blanket) Formula: A = πr 2 7 cm. Find the circumference and/

Lesson 6-2a Volumes Known Cross-sectional Areas. Ice Breaker Find the following: (without calculator) sec(π/6) = sin(4π/3) = cos²(π/8) + sin²(π/8) = 1.

) = 1 + tan²(π/8) = Objectives Find volumes of non-rotated solids with known cross-sectional areas Vocabulary Cross-section – a slice of a volume – an area obtained by cutting the solid with a plane Typically we see: –Squares: Area = s² –Rectangles: Area = l w –Semi-circles: Area = ½ π r² –Triangles: Area = ½ b h Volume of a Known Cross-Sectional Area Volume = ∑ Area thickness (∆variable) V = ∫ Area dx or V = ∫ Area dy Integration endpoints are based on/

Objective: Solve equations using area circumference, diameter, and radius.

.3mi C= 3.14(9.7) C ≈ 30.5in C= 2(3.14)(14) C ≈ 87.9cm C= 2(3.14)(7.6) C ≈ 47.7m r d Area of a circle - what’s inside the circle Formula : A = πr 2 10 in A = πr 2 A = π(5) 2 A = π(25) A = 3.14(25) A = 78.5 in 2  d= 40mi  r= 14cm/ 530.66 square feet. Find the radius. A = πr 2 530.66 = πr 2 π π 169 = r 2 13 ft = r Find the radius of a circle that has an area of 12,070 square feet A = πr 2 12070 = πr 2 π π 3843.95 = r 2 62 ft = r C = 56.52 in C = 2πr 56.52 = 2πr 56.52 = /

BeUrban in the Ruhr area Let’s become the safest region in Europe.

on group risk Golden circle “We see the Ruhr region as a polycentric urban area and therefore you need real city centres” Our key thought Future Fundamental thoughts Current Let’s apply this to Marl Depopulation Placemaking Multimodal axis between core areas Green belt How does this/ -Media Marketing -Activities for City centre -Awareness Cost StructureRevenue Streams Business model Short summary of BeUrban “We see the Ruhr region as a polycentric urban area and therefore you need real city centres”

INTRODUCTION Java is a true OO language the underlying structure of all Java programs is classes. Everything must be encapsulated in a class that defines.

it belongs to a certain class) 9 type MethodName (parameter-list) { Method-body; } ADDING METHODS TO CLASS CIRCLE 10 public class Circle { double radius; // radius of circle double x, y; // center of the circle // …Constructors go here //Methods to return circumference and area public double circumference() { return (2*Math.PI*radius); } public double area() { return (Math.PI * Math.pow(radius,2)); } Method Body ALL TOGETHER 11 public class/

Level 4+ 1-Jul-16Created by Mr. Lafferty Maths Dept. The Circle Circumference Diameter = Circumference ÷ π www.mathsrevision.com Area Radius = √(Area ÷

Lafferty 17 But the area inside this rectangle is also the area of the circle www.mathsrevision.com Area of a Circle Area = πr 2 Level 4+ 1-Jul-16Created by Mr. Lafferty Maths Dept. Area of a circle Q.Find the area of the circle ?Solution 4cm www.mathsrevision.com Level 4+ 1-Jul-16Created by Mr. Lafferty Maths Dept. Area of a circle Q. The diameter of the circle is 60cm. Find area of the circle?Solution www.mathsrevision.com/

Discovering Area of a Circle.

a calculator to try to solve the following problems on area of a circle. Area of a Circle Discovery 6 in. Find the area of the circle. Area of a Circle Discovery 11 m. Find the area of the circle. Find the area of the circle. Area of a Circle Discovery What is the radius if the diameter is 10 ft? 10 ft. Find the area of the circle. Take out your study guide! Area of a Circle Discovery Thats all Folks! The End! Take out your/

An Area Problem An Investigation.

carry out an investigation and see if you can determine the ‘largest possible’ area in each case. Record your results in the table below. Is there another shape which might give a bigger area with the 320m of fencing available? Design Shape Maximum possible area Square Rectangle Pentagon Hexagon Octagon Circle Semi Circle Parallelogram Other shape ? Solution Square - 6400 Rectangle – 6400 Pentagon – 7040 Hexagon – 7380.8/

The circumference and Area of a circle

What about the AREA of a circle? 2r Now consider a circle inside the square The area of the circle must be less than the are of the square A < 4r 2 r Area = ? xr 2 Finding a formulae for the area of a circle C= πd or C=2πr Semi-circle=πr πrπr r Area of Rectangle= Base x Height Area = πr x r Area =πr 2 The Area and Perimeter of a Circle A circle is defined/

Objective: Find the circumference and area of circles.

in. Circumference Find the circumference of a circle with radius 2. Find the circumference of a circle with diameter 8. Area of a Circle AreaArea of a circle is the amount of space the circle covers. Area of a Circle Find the area of a circle with radius 9. 9 feet Find the area of the circles below. 1)2) 6 in. 16 m Area of a Circle Find the area of a circle with radius 5. Area of a Circle Find the area of a circle with diameter 24. Instructional Conversation/

Prime Time Circle the seven prime numbers that, when added together, equal 75. 3, 11, 14, 13, 5, 17, 12, 6, 19, 23, 7, 9 Remember a prime number is a number.

+ 5 + 7 + 11 + 13 + 17 + 19 = 75 Area of Circles Lesson 11-6 Review of Circles r d The radius of a circle is half of the diameter. Divide the diameter by 2 to get the radius. Area of a Circle Area = r² The area of a circle equals the product of pi () and the square of its radius. r Area = r² Find the Area of the Circle Round the answer to the nearest tenth. Area = r² A = (4²) A = (16) A/