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?

Answer 1

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

Answer 2

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