geometry
posted by ARI33 on .
A semicircle has AB as the endpoints of its diameter, and AB=80. Points C and D are on the circumference of the semicircle such that AD=BC=40. What is the length of DC?

Since the radius is equal to the given chords, the central angle is 60 degrees.
(An inscribed hexagon has sides equal to the radius)
So, DC is also 40 
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