Question

prove that a cyclic parallelogram is always a rectangle​

Answer 1

AnswEr :-

Let ABCD is a cyclic quadrilateral such that it's diagonals AC & BD are the diameters of the circle.

Through the vertices A ,B ,C & D

as AC is diameter & angle in a semi circle is a right angle.

=> Angle ADC = 90 & Angle ABC = 90

Same as

BD is a diameter

=> Angle BCD = 90 & Angle BAD = 90

Thus , ABCD is a rectangle

Hence Proved