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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