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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

7. Surface Areas and Volumes of Cones

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Exercise 27 Page 646

Use the formula for the area of a circle.

153.94 ft^2

Practice makes perfect

The area of a circle with radius r is calculated using the formula below. A=π r^2 From the exercise, we know that the radius of the circle is 7 feet. By substituting 7 for r in the formula, we can calculate A.

A=π r^2

r= 7

A=π( 7)^2

▼

Evaluate right-hand side

Calculate power

A=π * 49

Use a calculator

A=153.93804 ...

Round to 2 decimal place(s)

A≈ 153.94

The area of the circle is approximately 153.94 ft^2.

Subchapter links

Communicate Your Answer p.641

Monitoring Progress p.642-644