38.) What is the circumference of a circle with radius 21?

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter8: Areas Of Polygons And Circles
Section8.4: Cicumference And Area Of A Cicle
Problem 30E: The ratio of the circumferences of two circles is 2:1. What is ratio of their areas?
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38.) What is the circumference of a circle with radius 21?

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