Prove that a non-isosceles trapezium is not a cyclic Share with your friends Share 0 Neha Sethi answered this Dear student Given ABCD is a non-isoscels triangle.In order to prove that this trapezium is not cyclic, we have to prove that the sum of opposite angle is equal to 180°.Now, Consider∠D+∠B=∠D+∠ABE+∠CBE=90°+90°+∠CBE=180°∠CBE>180°Hence, ABCD trapezium is not cyclic. Regards 0 View Full Answer