Answer
Direct variation
Work Step by Step
$c=2\pi*r$
$2*\pi$ is a constant
As $r$ increases, so does $c$. This is direct variation.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 11 - Rational Expressions and Functions - 11-6 Inverse Variation - Practice and Problem-Solving Exercises - Page 691: 39
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