Question

if the non parallel sides of trapezium are equal prove it is cyclic​

Answer 1

Step-by-step explanation:

The trapezium is symmetric so the angles ∠DAB and ∠ABC are equal. So we have ∠ABC+∠CDA=π, i.e. we have opposite angles in the trapezium add up to π. This is necessary and sufficient for a quadrilateral to be cyclic

Answer 2

Answer:

they are opposite. so they are equal.

sum of all angles of a quadrilateral is 360 degree.

since the sum of two angles is 180. the opposite sides are equal.