Prove that the parallelogram circumscribing a circle is a Rhombus.

If all the side of a parallelogram touch a circle, show that the parallelogram is a rhombus.OR Prove that a parallelogram circumscribing a circle is a rhombus.

Prove that the rectangle circumscribing a circle is a square

Assertion(A) If two tangents are drawn to a circle from an external point then they subtend equal angles at the centre. Reason (R ) A parallelogram circumscribing a circle is a rhombus

Prove that opposite sides of a quadrilateral circumscribing a circle,subtend supplementary angles at the centre of a circle.

Prove that opposite sides of a quadrilateral circumscribing a circle subtend supplementary angles at the centre of the circle.

Prove that opposite sides of a quadrilateral circumscribing a circle subtend supplementary angles at the centre of the circle.

Prove that the centre of the circle circumscribing the cyclic rectangle ABCD is the point of intersection of its diagonals.