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Big Ideas Math: Modeling Real Life, Grade 8 View details

1. Volumes of Cylinders

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Exercise 3 Page 429

Use the formula for the volume of a cylinder.

1.5 meters

Practice makes perfect

We are given the following cylinder and we want to find the value of its height.

The volume of a cylinder with the radius r and height h can be calculated by the following formula. V=π r^2 h Since we are given the volume and height of the cylinder, we can substitute them into the formula and calculate its radius.

V=π r^2 h

SubstituteII

V= 28, h= 4

28=π r^2 ( 4)

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Solve for r

CommutativePropMult

Commutative Property of Multiplication

28=4π r^2

DivEqn

.LHS /4π.=.RHS /4π.

28/4π=4π r^2/4π