Lesson 7-2 Circumference and Area of Circles. Definitions Circle - A set of points in a plane that are the same distance away from a given point in the.

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Lesson 7-2 Circumference and Area of Circles

Definitions Circle - A set of points in a plane that are the same distance away from a given point in the plane, called the center. Radius - the distance from the center to any point on the circle. Diameter - the distance across the circle through the center of the circle. Circumference - The distance around the outside of a circle.

Definitions Pi ( ) - The ratio of the circumference of a circle to its diameter. (3.14…) Circumference -, or

Find the circumference of each circle. Round to the nearest tenth. 5 ft. 

 3.8 m

Area of a Circle Area of a Circle -

Find the area of each circle. Round to the nearest tenth.  3 yd

10 in 

12 ft  4 ft The Bowers have a circular pool with a radius of 12 feet. They plan on installing a 4- foot wide walkway around the pool. What will be the area of the walkway?