Answer
$c=38^{\circ}$
Work Step by Step
We are given that the two angles are supplementary.
So, we can write
$c+(4c-10)=180^{\circ} \\ 5c=190^{\circ} \\ c=38^{\circ}$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 10 - Area - 10-6 Circles and Arcs - Practice and Problem-Solving Exercises - Page 656: 47
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