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Two congruent semicircles lie on the diameter of a third semicircle, each tangent to the other two. A small circle is tangent to all three semicircles. If the area of the shaded region is 45pi, what is the length of the radius of the small circle.© BrainMass Inc. brainmass.com April 3, 2020, 1:42 pm ad1c9bdddf
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Let the circles be A B C D
Radius of A is 2r
B and C is r
The radius of a circle tangent to two other circles is found.