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Glencoe Math: Course 2, Volume 2 View details

2. Area of Circles

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Exercise 1 Page 626

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

About 78.5cm^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= 5. Let's calculate the area using this information. We can use 3.14 for π.

A = π r^2

Substitute

r= 5

A = π ( 5^2)

π ≈ 3.14

A ≈ 3.14 (5^2)

CalcPow

Calculate power

A ≈ 3.14 (25)

Multiply

A ≈ 78.5

We found that A ≈ 78.5, which means that the area of the circle is about 78.5 square centimeters.