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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

1. Circumference and Arc Length

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Exercise 3 Page 598

Do you remember the formula for the circumference of a circle?

≈ 37.7in.

Practice makes perfect

The circumference C of a circle with radius r is calculated using the formula below. C=2π r From the exercise, we know that the radius of the circle is 6 inches. By substituting 6 for r in the formula, we can calculate C.

C=2π r

r= 6

C=2π( 6)

Multiply

C=12π

Use a calculator

C=37.699111...

Round to 1 decimal place(s)

C≈ 37.7

The circumference of the circle is approximately 37.7 inches.

Subchapter links

Communicate Your Answer p.593

Monitoring Progress p.594-597

Exercises p.598-600