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Glencoe Math: Course 3, Volume 2

GM

Glencoe Math: Course 3, Volume 2 View details

3. Volume of Spheres

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Exercise 34 Page 612

Recall the formulas for finding the circumference and the area of a circle.

about 113.1cm^2

Practice makes perfect

We need to find the area of the circle. Similar to the perimeter, the area of a circle with radius r is calculated using the formula below. A=π r^2 We know that the radius of the circle is 6cm. By substituting 6 for r in the formula, we can calculate A.

A=π r^2

r= 6

A=π( 6)^2

Calculate power

A=π(36)

CommutativePropMult

Commutative Property of Multiplication

A=36π

Use a calculator

A=113.097335...

Round to 1 decimal place(s)

A≈ 113.1

The area of the circle is approximately 113.1 square centimeters.

Subchapter links

Guided Practice p.608

Independent Practice p.609-610

H.O.T. Problems p.610

Standardized Test Practice p.610-612

Extra Practice p.611

Common Core Review p.612