Answer
$40^{\circ}$
Work Step by Step
We can see that the arc around a circle measures $360^{\circ}$.
So, we can write
$(x+40)+(2x+60)+(3x+20)=360^{\circ} \\ 6x+120^{\circ}=360^{\circ} \\ x=40^{\circ}$
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: 48
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