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Area and Circumference of Circles. 1. Radius- any line segment that connects the center to a point on the circle VOCABULARY Radius.

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Presentation on theme: "Area and Circumference of Circles. 1. Radius- any line segment that connects the center to a point on the circle VOCABULARY Radius."— Presentation transcript:

1 Area and Circumference of Circles

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

3 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.

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

5 A=π r 2 Formulas C= 2πr Or C= πd

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

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

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

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

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

11 pi html


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