Question

PLZ PLZ ...help me.:prove that angle bisector of the angle formed by producing opp. sides of a cyclic quad. intersects at 90°

Answer 1

let's say ABCD is a cyclic quadrilateral,

and angle ABC and angle ADC are opposite angles.

so, Angle ABC + angle ADC = 180( sum of opposite angles of a cyclic quadrilateral is 180 degrees)

and an angle is formed by joing these two angles.and we have to prove that it's half is 90°

so,

(ABC+ADC)/2 = 90°

hence proved..

for further help, u can follow me