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Tangential Quadrilateral Formula

The tangential quadrilateral is a convex quadrilateral in euclidean geometry,whose all sides are tangent to a single circle within the quadrilateral. In other word a quadrilateral which has an in-circle. This is also called as circumscribed quadrilateral.

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Formula Tangential Quadrilateral

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Let a convex quadrilateral ABCD with sides a, b, c, d, then the area of a Tangential quadrilateral is, 
a + c = b + d :

Since opposite angles are supplementary angles. 

Example Tangential Quadrilateral

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Below are examples on cyclic quadrilateral:
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