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Pi Day is celebrated on March 14th (3/14) around the world. Pi is the word for the Greek letter “π.”
Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational number, it will continue infinitely without repetition or pattern.
By holding hands and making a circle, these children are demonstrating circumference.
Let’s practice,… C=πd C=3.14x8 C=25.12 So, the circle’s circumference is 25.12cm. (diameter) (8 centimeters)
Now you try,… A circle has a diameter of 10 centimeters. What is the circumference? C=πd
C=3.14x10 C=31.40 So, the circle’s circumference is 31.40cm.
Pi is pretty cool, but you can do more than just find the circumference.
Let’s practice,… A=πr 2 A=3.14x6 2 A=3.14x6x6 A=113.04cm 2 So, the area of the circle is cm 2. 6 cm radius
Now you try,… A circle has a radius of 4 centimeters. What is the area of the circle? A=πr 2
A=3.14x4 2 A=3.14x4x4 A=50.24cm 2 So, the area of the circle is 50.24cm 2.
CIRCLES CIRCUMFERENCE & AREA. CIRCUMFERENCE C = ΠdorC = 2Πr 12cm.
Circles. Center Radius Radii Diameter Chord.
Lessons 6.5 Circumference and 8.5 Area of a Circle PI π = Ratio of Circumference to Diameter HOMEWORK: Lesson 6.5/1-13 Lesson 8.5/1-10.
1 of 84 SHAPE AND SPACE Circles. 2 of 84 The circumference of a circle Use π = 3.14 to find the circumference of this circle. C = πd 8 cm = 3.14 × 8 =
The Circle. The language of circles Circumference: The distance round the circle Circumference: The distance round the circle Diameter: the distance from.
Circumference Lesson #33. What is Circumference? The distance around the outside of a circle is called the circumference (essentially, it is the perimeter.
Circles Shape and Space. The value of π For any circle the circumference is always just over three times bigger than the radius. The exact number is called.
Circles Circumference and Area 6 th Grade Math LaVergne Middle School.
8.7 Circumference and Area of Circles. Definition A circle is the set of all points in a plane that are the same distance from a given point, called.
Math Circumference of Circles & Area of Circles. Vocabulary A circle is the set of all points in a plane that are the same distance from a given point,
C=π d C=2πr r=½d d=rx2 A=πr² The diameter is the longest chord. The ratio of the circumference is always …. π is a Greek letter. π can also.
Circles Yes I know we did this yesterday. Circumference Posh name for the perimeter of a circle Measured in normal units of length cm etc. But how do.
March 14 (03/14): International Pi Day. What is Pi? Pi is represented by the Greek symbol This symbol is used because it is the first letter of the.
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.
Introduction to circles Area examples Let’s investigate… Circumference Circumference examples Area of a circle The Circle
Surface Area - Cuboid and Cylinder 15-Feb-14 A cuboid is just a name for a box shape Objective Calculate the surface of a cuboids and cylinders Objective.
8-1C The Circumference of a Circle What is circumference? What is pi? What is the symbol for pi? What are the formulas for the circumference of a circle?
Revision Formulae: Diameter = 2 x Radius Area of Circle = πr 2 Circumference of circle = 2πr = πd π = 3.14 approximately.
Circles: Area and Circumference. Definitions Circumference: Distance around the outside of a circle Area: How many squares it takes to cover a circle.
investigate the relationship between the diameter and circumference of a circle.
+ Bell Work Solve 25 ⅚ -18 ⅜ 5 ⅛ + 7 ⅘. + Bell Work Answer 25 ⅚ -18 ⅜ 25 20/24 – 18 9/ /24 5 ⅛ + 7 ⅘ 5 5/ / /40.
The Perimeter Of A Shape. 10m Regular Octagon 6cm 4cm 5cm 3cm 4cm.
Find the circumference of the following circles: (Write the formula that you will use.)
Area and Circumference of Circles. 1. Radius- any line segment that connects the center to a point on the circle VOCABULARY Radius.
Review Multiplying decimals: 3.2 x 5.12 Multiplying fractions and whole numbers: 5 x 2/3.
0 x x2 0 0 x1 0 0 x3 0 1 x7 7 2 x0 0 9 x0 0.
Welcome to Are You Smarter Than a 5 th Grader? --Pi Day Edition 2-- with your host, Mrs. Burke.
Circles – Circumference and Area Circumference – the distance around a circle.
Pleased to Meet You Five people meet in a room. Each one shakes hands with the other four. How many handshakes are there? (Hint: Draw a picture)
Note 2: Perimeter The perimeter is the distance around the outside of a shape. Start at one corner and work around the shape calculating any missing sides.
Parts of a Circle & Circumference Textbook page 516 IAN page 120.
Introduction & Installation. Circles A circle is a shape with all points the same distance from the center. A circle is named by the center. The circle.
Circles OCR Stage 6. diameter Circumference radius Tangent radius is diameter ÷ 2.
Name ______ Gr.__ Lesson 4.2 – Circumference of a Circle Jan.__ Objective: to investigate the relationship between the circumference and diameter of a.
Circles By Freddie And Liam. Radius and Diameter Radius is ALWAYS half the diameter. Diameter is ALWAYS double the radius 1) If the diameter of a circle.
Meaning of Pi 1 The Meaning & Use of Pi by Joseph A. Castellano, Ph.D.
Welcome to Are You Smarter Than a 5 th Grader? --Pi Day Edition 1-- with your host, Mrs. Burke.
Starter Calculate the Circumference of each of these shapes. Remember that in any circle: Circumference = π x Diameter or C = πd or C = 2πr a)b)c) 10cm.
AREA OF COMPOSITE FIGURES. COMPOSITE FIGURES A composite figure is made of triangles, quadrilaterals, semicircles, and other 2-D figures. A semicircle.
6 th Grade SPI: Calculate with circumferences and areas of circles.
Geometry 11.5 Circumference and Area of Circles. Let’s talk about Pi……… Pi is the ratio of the circumference of a circle to its diameter. The symbol for.
5 x4. 10 x2 9 x3 10 x9 10 x4 10 x8 9 x2 9 x4.
9-1 Exploring Circles Objectives: To identify and use parts of circles. To solve problems involving the circumference of a circle.
Circumference and Area: Circles. Formulas C = πd or 2πr A = πr 2.
By Renikki Alexander IDT 7062 Let’s Listen to the Circle Song "πr 2 sounds like area to me and when I need circumference I'll use πd."
CIRCLE Circle is the locus Of all poins equidistant From a central poins.
Area and Circumference of a Circle 2 Definitions A circle is the set of all points in a plane that are the same distance from a fixed point called the.
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2 x0 0 12/13/2014 Know Your Facts!. 2 x1 2 12/13/2014 Know Your Facts!
Objective: Solve equations using area circumference, diameter, and radius.
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