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Pearson Geometry Common Core, 2011

PG

Pearson Geometry Common Core, 2011 View details

8. Perimeter, Circumference, and Area

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Exercise 23 Page 65

Use that A=π r^2 to find the area.

400π m^2

Practice makes perfect

To find the area of a circle, we use the following formula. A=π r^2 We know that this circle has a radius of 20 meters, so we can substitute 20 for r in the formula.

A=π r^2

r= 20

A=π* 20^2

Calculate power

A=π*400

Multiply

A=400π

The area is 400π m^2.

Subchapter links

Lesson Check p.64

Practice and Problem-Solving Exercises p.64-67

Standardized Test Prep p.67

Mixed Review p.67