A Quadrilateral ABCD | Circumscribe | Prove AB + CD = AD + BC | Circles | CBSE Class10 | Izhar Sir |

A quadrilateral ABCD is drawn to circumscribe a circle (see figure). Prove that:
AB + CD = AD + BC

Since the sides of quadrilateral ABCD, i.e., AB, BC, CD and DA touch the circle at P, Q, R and S respectively, and the lengths of two tangents to a circle from an external point are equal.
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