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Glencoe Math: Course 2, Volume 2

GM

Glencoe Math: Course 2, Volume 2 View details

2. Area of Circles

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Exercise 2 Page 627

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

About 2464in.^2

Practice makes perfect

Let's consider the given circle.

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= 28. Let's calculate the area using this information. We can use 227 for π.

A = π r^2

r= 28

A = π ( 28^2)

π ≈ 22/7

A ≈ 22/7 (28^2)

Calculate power

A ≈ 22/7 (784)

MoveRightFacToNum

a/c* b = a* b/c

A ≈ 22* 784/7

Multiply

A ≈ 17 248/7

Calculate quotient

A ≈ 2464

We found that A ≈ 2464, which means that the area of the circle is about 2464 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