Answer
$4$
Work Step by Step
Generally, the radius of curvature is $\frac{1}{\kappa}$. The curvature of a circle with radius $4$ is $\frac{1}{4}$. So the radius of curvature of a circle of radius $4$ is equal to $\frac{1}{1/4}=4$.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 14 - Calculus of Vector-Valued Functions - 14.4 Curvature - Preliminary Questions - Page 734: 6
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