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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

2. Areas of Circles and Sectors

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Exercise 5 Page 606

Recall the formula for finding the area of a circle.

About 78.54 in^2

Practice makes perfect

The area of a circle with radius r is calculated using the formula below. A=π r^2 We know that the radius of the circle is 5 inches. By substituting 5 for r in the formula, we can calculate A.

A=π r^2

r= 5

A=π( 5)^2

Calculate power

A=π * 25

Use a calculator

A=78.539816 ...

Round to 2 decimal place(s)

A≈ 78.54

The area of the circle is approximately 78.54 in^2.

Subchapter links

Communicate Your Answer p.601

Monitoring Progress p.602-605