body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Big Ideas Math: Modeling Real Life, Grade 8

BI

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

1. Volumes of Cylinders

Continue to next subchapter

Exercise 13 Page 431

Use the formula for the volume of a cylinder.

245π cubic feet or 769.7 cubic feet

Practice makes perfect

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

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 radius and height of the cylinder, we can substitute them into the formula and calculate its volume.

V=π r^2 h

r= 7, h= 5

V=π ( 7)^2 ( 5)

▼

Solve for V

Calculate power

V=π (49)(5)

Multiply

V=245π

π= 3.141592...

V=245( 3.141592...)

Multiply

V=769.690200...

Round to 1 decimal place(s)

V ≈ 769.7

Therefore, the volume of the given cylinder is 245π cubic feet or about 769.7 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