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Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
6. Circles and Arcs
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Exercise 70 Page 657

Recall the formula for finding a circumference?

17π in. or about 53.4in.

Practice makes perfect
The circumference C of a circle with diameter d is calculated using the formula below. C=π d We are told that the diameter of the circle is 17 inches. By substituting 17 for d in the formula, we can calculate C.
C=π d
Substitute

d= 17

C=π( 17)
CommutativePropMult

Commutative Property of Multiplication

C=17π
UseCalc

Use a calculator

C=53.407075...
RoundDec

Round to 1 decimal place(s)

C≈ 53.4
The circumference of the circle is 17π inches or about 53.4 inches.
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