The figure shows three concentric circles C1, C2, and C3 with center O. Points A and B are on circle C1 so that the triangle OAB is equilateral. Circle C4 with center B and congruent with circle C3 cuts circle C2 at D. ME is the perpendicular bisector of AD (E on C3). Prove that the triangle ADE is equilateral.
See also: Augmented Reality