Quadrilateral Circumscribing a Circle
Quadrilateral circumscribing a circle (also called tangential quadrilateral) is a quadrangle whose sides are tangent to a circle inside it.
![Tangential Quadrilateral](/sites/default/files/images/tangential-quadrilateral.gif)
Area,
$A = rs$
Where r = radius of inscribed circle and s = semi-perimeter = (a + b + c + d)/2
Derivation for area
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