Hello, fardeen_gen!

Is there a typo ... or omitted information?

. . The statement is not true . . .

Counter-example . . .Let be a quadrilateral inscribed in a circle with center

Prove that: .Code:A * * * B o o * \ / * * \ / * \ / * \ / * * *O * * / \ * / \ * / \ * * / \ * o o D * * * C

For the statement to be true,

. . and must be perpendicular diameters ... always!