Chord Distance

Geometry Level 4

A circle has diameter AD AD of length 400400. BB and CC are points on the same arc of ADAD such that AB=BC=60|AB|=|BC|=60. What is the length CD|CD|?

Details and assumptions:

Lengths given are always straight line distances, not arc lengths. We use | \cdot | in this problem to make the distinction clearer.

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