body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Glencoe Math: Course 2, Volume 2

GM

Glencoe Math: Course 2, Volume 2 View details

2. Area of Circles

Continue to next subchapter

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.

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

r= 7

A = π ( 7^2)

π ≈ 22/7

A ≈ 22/7 (7^2)

Calculate power

A ≈ 22/7 (49)

MoveRightFacToNum

a/c* b = a* b/c

A ≈ 22* 49/7

Multiply

A ≈ 1078/7

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