Four Points on a Semicircle

Geometry Level 3

A semicircle has ABAB as the endpoints of its diameter, and AB=400AB= 400. Points CC and DD are on the circumference of the semicircle such that AD=BC=100AD = BC = 100. What is the length of DCDC?

Details and assumptions:

  • Lengths given are always the straight line distance between two points, unless otherwise indicated.
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