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Published bySharon Paula Arnold Modified over 8 years ago

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Math Circumference of Circles & Area of Circles

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Vocabulary A circle is the set of all points in a plane that are the same distance from a given point, called the center. The circumference C is the distance around a circle. The radius r is the distance from the center to any point on a circle. The diameter d is the distance across a circle through its center.

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Vocabulary The diameter of a circle is 2 times the radius, or d = 2r. An approximation for π is 3.14.

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Circumference of a Circle The circumference C of a circle is equal to its diameter d times π, or 2 times its radius r times π. C = πd or C = 2πr

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1. Radius = 8 ft 2. Radius = 7 yd 3. Diameter = 21 ft 4. Diameter = 14 m 5 Calculate the circumference

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Math Area of a Circle

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The area A of a circle equals the product of π and the square of its radius. A = πr²

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1. Radius = 8 cm 2. Diameter = 17 cm 3. Diameter = 6.5 m 4. Radius = 9 in 8 Calculate the area

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Find the radius of a circle that has an area of 42 square centimeters. Round to the nearest tenth. 9 CHALLENGE

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