Prove that trapezoid inscribed in a circle is isosceles?
I have a trapezoid ABCD ...dont know how to prove digonals AC = BD? Help...
Draw lines from the center of thecircle to each vertex. consider the triangles formed and use the fact that the sides from the center to the vertices are all congruent. You will probably need to consider two cases: where the center of the circle is inside the trapezoid and where it isn't.
Last edited by HallsofIvy; Dec 28th 2009 at 04:24 AM.