Four Points on a Semicircle
A semicircle has \(AB\) as the endpoints of its diameter, and \(AB= 400\). Points \(C\) and \(D\) are on the circumference of the semicircle such that \(AD = BC = 100\). What is the length of \(DC\)?
Details and assumptions:
- Lengths given are always the straight line distance between two points, unless otherwise indicated.