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Glencoe Math: Course 3, Volume 2

GM

Glencoe Math: Course 3, Volume 2 View details

1. Volume of Cylinders

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Exercise 20 Page 596

Recall the formula for finding the area of a circle.

About 176.7 in.^2

Practice makes perfect

We are given a circle and we want to find its area.

The area of a circle with radius r is calculated using the formula below. A=π r^2 To use the formula, we first need to divide the diameter by 2 to determine the radius. r=d/2 From the figure we know that the diameter of the circle is 15inches. Let's find the radius!

r= d/2

d= 15

r = 15/2

Write as a decimal

r = 7.5

Now, by substituting 7.5 for r in the formula, we can calculate A.

A=π r^2

r= 7.5

A=π( 7.5)^2

Calculate power

A=π(56.25)

Use a calculator

A=176.714587...

Round to 1 decimal place(s)

A≈ 176.7

The area of the circle is approximately 176.7 square inches.

Subchapter links

Guided Practice p.592

Independent Practice p.593-594

H.O.T. Problems p.594

Standardized Test Practice p.594-596

Extra Practice p.595

Common Core Review p.596