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Glencoe Math: Course 3, Volume 2 View details

2. Volume of Cones

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Exercise 20 Page 603

Use the formula for the volume of a cone.

Approximately 132.5in^3

Practice makes perfect

We are told that a cone has a height of 9 inches and a base whose diameter is 7 12 inches. Let's start by drawing it.

To find the volume, we can use the formula for the volume of a cone. V= 13π r^2 h Here, r is the radius and h is the height of the cone. We already know that the height of the cone is 9 inches. To find r we can divide the diameter d by 2.

r = d/2

Substitute

d= 7 12

r = 7 12/2

▼

Evaluate right-hand side

MixedToFrac

a bc=a* c+b/c

r = 152/2

MoveNumRight

a/b=1/b* a

r = 1/2 (15/2)