Exercise 2 Page 626

The area of a circle equals the product of π and the square of its radius.

About 154in.^2

Practice makes perfect

Let's consider the given circle.

We want to find the area of the circle. Recall that the area A of a circle equals the product of π and the square of its radius r. A = π r^2 In this case, r= 7. Let's calculate the area using this information. We can use 227 for π.

A = π r^2

Substitute

r= 7

A = π ( 7^2)

π ≈ 22/7

A ≈ 22/7 (7^2)

CalcPow

Calculate power

A ≈ 22/7 (49)

MoveRightFacToNum

a/c* b = a* b/c

A ≈ 22* 49/7

Multiply

A ≈ 1078/7

CalcQuot

Calculate quotient

A ≈ 154

We found that A ≈ 154, which means that the area of the circle is about 154 square inches.

Subchapter links

Guided Practice p.626

Independent Practice p.627-628

H.O.T. Problems p.628

Standardized Test Practice p.628-630

Extra Practice p.629

Common Core Review p.630

Exercise 2 Page 626

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