Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 8 - Geometry - Summary Exercises - Perimeter, Circumference and Area - Page 579: 2

Answer

The diameter is twice the length of the radius. See image.

Work Step by Step

In the image below, we show a circle with radius (r) and diameter (d). The diameter is twice the length of the radius: $d=2r$ Put another way, the radius is half the length of the diameter: $r=d/2$
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