Question

ABCD is a cyclic quard. then prove that : (

Answer 1

Answer:

Theorem: If the sum of a pair of opposite angles of a quadrilateral is 180^0, the quadrilateral is cyclic. Thus, ∠BED=∠C ∠ B E D = ∠ C . ... This can only mean that our supposition that ABCD is not cyclic is incorrect – ABCD is cyclic ! That completes our proof.