Two circles are tangent to a third circle internally and tangent to each other externally. If the distances between their centers are 10 cm, 7 cm, and 5 cm, respectively, find the sum of the radius of the three circles.  a. 20 b. 21 c. 22 d. 23

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.1: Angles
Problem 29E
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Two circles are tangent to a third circle internally and tangent to each other externally. If the distances between their centers are 10 cm, 7 cm, and 5 cm, respectively, find the sum of the radius of the three circles. 

a. 20

b. 21

c. 22

d. 23 

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