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Area and Circumference of Circles
Circumference of a Circle Formula to MEMORIZE!!!! OR
What do the letters stand for? C = circumference r = radius of the circle d = diameter of the circle π = pi. The value of πis “3.14”
Area of a Circle Formula to MEMORIZE!!!!
What do the letters stand for? A = area r = radius of the circle π = pi. The value of πis “3.14”
Question 1 When looking for area, and you only have the diameter, what is the FIRST thing you must do? * Split the diameter in half to get the radius.
Question 2 What is another name for circumference of a circle? * Perimeter!
Example 1 Find the area of a circle with a diameter of 24 in. Answer:
Example 2 Find the circumference of a circle with a diameter of 20 m. Answer:
Example 3 Find the area of a circle with a radius of 6 cm. Answer:
Example 4 Find the circumference of a circle with a radius of 4 km. Answer:
Example 5 The circumference of a circle is 120 mi. What is the diameter to the nearest tenth. Answer:
Example 6 The circumference of a circle is 72 m. What is the radius to the nearest tenth. Answer:
Question What do you notice about the labels between area and circumference? - Area has a squared sign on the unit, but circumference does not.
Question Why do you think the area label has the squared sign? - To find the area, you must ‘square’ the radius.
Challenge What is the area of the square if a circle with a radius of 4 in. is inscribed in a square? 4 in Answer: 64 in 2
5th Grade Miss Cameron’s Class
Circles 9.3 Page 532 DiameterIs a segment that passes through the center of the circle and has endpoints on the circle. Segment AC is the diameter. D =
Definition: A circle is the set of all points on a plane that is a fixed distance from the center.
Perimeter Rectangles, Squares, and Triangles Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure,
EXAMPLE 1 Find the perimeter and area of a rectangle SOLUTION Basketball Find the perimeter and area of the rectangular basketball court shown. PerimeterArea.
Area and Circumference of Circles
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.
Squares, Area, and Perimeter Test #7. Question 1 Area = 25cm 2 What is the perimeter?
investigate the relationship between the diameter and circumference of a circle.
Chapter 10 Lesson 1: Circles and Circumference Objective: Learn to find the circumference of circles.
Circumference & Area of Circles Unit 5-3. Circumference Formula for Circumference: ** r is the radius ** ** 2r = d. d is the diameter. ** **Circumference.
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,
written by Rob Oliver Score.
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?
Circumferences and Areas of Circles COURSE 3 LESSON 8-8 The diameter of a small pizza is 24 cm. Find its area. Round to the nearest tenth. A = r 2 Use.
Warm-Up Multiply. 1.89 x 97 x 76 x 34 4.38 x 28.
Lesson 10-7 Pages Circumference and Area: Circles.
Circumference and Area of a Circle. Diameter Radius centre What is the formula relating the circumference to the diameter?
Objective Apply formulas for perimeter, area, and circumference.
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