If the sides of a quadrilateral touch a circle, prove that the sum of a pair of opposite sides is equal to the sum of the other pair.
Since length of a tangent drawn from external points to a circle are equal.

Question

If the sides of a quadrilateral touch a circle, prove that the sum of a pair of opposite sides is equal to the sum of the other pair.

Philoid · Accepted Answer

Since length of a tangent drawn from external points to a circle are equal.