Posted by ARI33 on Monday, February 11, 2013 at 1:24am.
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?

geometry  Steve, Monday, February 11, 2013 at 4:57am
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 
geometry  EINSTEIN AND MORSE, Sunday, February 17, 2013 at 7:20am
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