Glencoe Math: Course 3, Volume 2
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Glencoe Math: Course 3, Volume 2 View details
2. Volume of Cones
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Exercise 30 Page 604

Use the formula for volume of a pyramid.

Approximately 3.5 in.^3

Practice makes perfect

We are given a pyramid. Its base is a rectangle with sides of 1.9 and 2.4 inches. The height of the pyramid is 2.3 inches.

The volume of a pyramid can also be calculated using a known formula. V=1/3Bh Here V is the volume, B is the area of the base, and h is the height. The area of the rectangle equals the product of the lengths of its sides. B = ab Here a and b are 1.9 and 2.4. We already have enough information to calculate the volume of the cone.
V = 1/3Bh
V = 1/3 a b h
V = 1/3 ( 2.4)( 1.9)( 2.3)
Evaluate right-hand side
V = 1/3(10.488)
V = 10.488/3
V = 3.496
V ≈ 3.5
The approximate volume of the pyramid is 3.5 cubic inches.