In the diagram, K, O, and M are the centers of the three semi-circles. Also, OC = 42 and CB = 56. What is the area of the shaded region?
OC = 42 CB = 56
AB = 2(OC + CB) = 176 AO = AB/2 = 88
AK = 1/2(AB - CB) = 60
Radii are: 28, 60, and 88
