You are given a circle with center O and radius r. Two chords of the circle, AB and CD , are equal and parallel to each other. E is a point between B and D on the perimeter of the circle. You are given radius of the circle r and length of the chord AB. You have to calculate angle AEC.
This is a companion discussion topic for the original entry at https://toph.co/p/geometry-is-fun-huh