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Pearson Geometry Common Core, 2011

PG

Pearson Geometry Common Core, 2011 View details

7. Areas of Circles and Sectors

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Exercise 1 Page 663

Recall the formula for finding the area of a circle.

64π in.^2

Practice makes perfect

The area of a circle with radius r is calculated using the formula below. A=π r^2We know the diameter is 16inches. We can get a value for r by dividing the diameter by 2. r = 162 in. = 8 in. By substituting 8 for r in the formula, we can calculate the area A.

A=π r^2

r= 8

A=π( 8)^2

Calculate power

A=π(64)

Multiply

A=64π

The area of the circle is 64 π square inches.

Subchapter links

Lesson Check p.663

Practice and Problem-Solving Exercises p.663-666

Standardized Test Prep p.666

Mixed Review p.666