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Area and Circumference of Circles

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1. Radius- any line segment that connects the center to a point on the circle VOCABULARY Radius

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2. Diameter- any line segment that passes through the center of the circle and connects two points on the circle. The diameter is twice the length of the radius.

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3. Circumference is the word used to describe the distance around the outside of a circle.

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A=π r 2 Formulas C= 2πr Or C= πd

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What is pi? Pi is the ratio of the circumference of the circle to its diameter. π

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Pi is an infinite decimal. Lets take a look….. The first 500 digits of pi.

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Practice Problems 1. A hot tub has a diameter of 6 feet. What is the circumference and area of the hot tub?

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Practice Problems 2. The circumference of your CD is 28.26 cm. What is the radius?

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Practice Problems 3. The radius of a circular rug is 4 ft. What is the circumference and area of the rug?

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http://www.ballandclaw.com/upi/ pi.50000.html

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