Each of the two equal circles passes through the centre of the other. The two circles intersect each other at points A and B. A straight line through the point A intersects the two circles at points C and D. Prove that triangle BCD is equilateral.
Each of the two equal circles passes through the centre of the other. The two circles intersect each other at points A and B. A straight line through the point A intersects the two circles at points C and D. Prove that triangle BCD is equilateral.