Problem #PRU-56572

Problems Geometry Plane geometry Circles Connection between the arc length, the angle, and the chord

Problem

The isosceles trapeziums $A B C D$ and $A_{1} B_{1} C_{1} D_{1}$ with corresponding parallel sides are inscribed in a circle. Prove that $A C = A_{1} C_{1}$ .

To see the solution register and get verified.