 Hi and welcome to the session. Let us discuss the following question. The question says proof that a cyclic parallelogram is a rectangle. Let's first make a figure of this question. This is the cyclic parallelogram. We have to show that it is a rectangle. Let's write down the given information. A, B, C, D is the cyclic parallelogram. We have to show that it is a rectangle. Let's hand begin with the proof. Cyclic co-delay trail E is equal to 180 degree because cyclic co-delay trail is 180 degree. Parallelogram therefore equal to angle C because in parallelogram opposite angles are equal to 180 degree. So this implies both angle A and angle C equal to 90 degree. It is a cyclic co-delay trail. Angle D is also equal to 180 degree. But angle B is equal to angle D because opposite angles in a parallelogram are equal. So this implies both angle B and angle D are equal to 90 degree. You can see that all the angles of co-delay trail A, B, C, D are equal to 90 degree. As each angle is of 90 degree, therefore A, B, C, D is a rectangle. Because in a rectangle all angles are of 90 degree. Hence we have proof that A, B, C, D is a rectangle. So this completes the session. I and take care.