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Glencoe Math: Course 2, Volume 2

GM

Glencoe Math: Course 2, Volume 2 View details

5. Volume of Pyramids

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Exercise 18 Page 659

Use the formula for the volume of a pyramid.

about 61.4 cubic centimeters

Practice makes perfect

We want to find the volume of the following pyramid.

We can calculate the volume of a pyramid using the following formula. V=1/3Bh Here, B is the area of the base, and h is the height. The base of our pyramid is a square with a side length of 4.8 centimeters. Its area B is a square of its side. Let's find it! B = ( 4.8)^2 = 23.04 The base's area B is 23.04 square centimeters. The height h is 8 centimeters. Let's substitute these values into the formula and calculate V.

V=1/3Bh

B= 23.04, h= 8

V=1/3( 23.04)( 8)

▼

Simplify right-hand side

Multiply

V=1/3(184.32)

MoveRightFacToNumOne

1/b* a = a/b

V=184.32/3

Calculate quotient

V=61.44

Round to 1 decimal place(s)

V≈ 61.4

The volume of the pyramid is about 61.4 cubic centimeters.

Subchapter links

Guided Practice p.656

Independent Practice p.657-658

H.O.T. Problems p.658

Standardized Test Practice p.658-660

Extra Practice p.659

Common Core Review p.659