Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 10 - Geometry - 10.4 Area and Circumference - Concept and Vocabulary Check - Page 646: 6


$\pi$ d

Work Step by Step

The circumference, C, of a circle with diameter d is given by the formula $\pi$d. The diameter, d, is a line segment through the center whose endpoints both lie on the circle, and the length of the diameter is twice the length of the radius. (d = 2r) As we know, C = 2$\pi$r Therefore, by using d =2r, we know that C = $\pi$d
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