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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

1. Volumes of Cylinders

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Exercise 1 Page 428

Use the formula for the volume of a cylinder.

754.0 cubic feet

Practice makes perfect

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 both the radius and height of the cylinder, we can substitute them into the formula and calculate V.

V=π r^2 h

r= 4, h= 15

V=π ( 4)^2 ( 15)

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Simplify right-hand side

Calculate power

V=π(16)(15)

Multiply

V=240π

Use a calculator

V=753.982236...

Round to 1 decimal place(s)

V ≈ 754.0

The volume of the cylinder is about 754.0 cubic feet.

Subchapter links

Try It p.428-429

Self-Assessment for Concepts & Skills p.429

Self-Assessment for Problem Solving p.430

Review & Refresh p.431

Concepts, Skills, & Problem Solving p.431-432