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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 23 Page 629

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

About 91.6yd^2

Practice makes perfect

We are given a circle with a diameter of 10.8 yards.

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 Since the diameter of the circle is 10.8 yards, the radius of the circle is ( 12* 10.8) yards or 5.4 yards. Let's calculate the area using this information. We can use 3.14 for π.

A = π r^2

r= 5.4

A = π ( 5.4^2)

π ≈ 3.14

A ≈ 3.14 (5.4^2)

Calculate power

A ≈ 3.14 (29.16)

Multiply

A ≈ 91.5624

Round to 1 decimal place(s)

A ≈ 91.6

We found that A ≈ 91.6, which means that the area of the circle is about 91.6 square yards.

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