Geometry Problems, Online Education

Online Geometry Problem 600: Circle, Area, Common Tangent, Semicircle, Tangency Point

The figure shows the tangent circles of diameters AB, BC, CD, and AD. Line EFG is tangent to circles AB, BC, and CD at E, F, and G, respectively. If EF = 9 and FG = 1, find the area of the orange region.


Circle, Semicircle Area, Tangent, Diameter