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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 30 Page 65

To find the area, use the formula A=π r^2.

452.4 in.^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 12 inches, so we can substitute 12 for r in the formula.

A=π r^2

r= 12

A=π( 12)^2

Calculate power

A=π(144)

Use a calculator

A=452.3893421

Round to 1 decimal place(s)

A≈452.4

The area is approximately 452.4 inches^2.

Subchapter links

Lesson Check p.64

Practice and Problem-Solving Exercises p.64-67

Standardized Test Prep p.67

Mixed Review p.67