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In Figure, a quadrilateral ABCD is drawn...

In Figure, a quadrilateral ABCD is drawn to circumscribe a circle .
Prove that
`AB+CD=BC+AD`

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A quadrilateral ABCD is drawn to circumscribe a circle.Prove that AB+CD=AD+BC

In figure, a quadrilateral ABCD is drawn to circumscribe a circle such that its sides AB, BC, CD and AD touch the circle at P, Q, R and S respectively. If AB = x cm, BC = 7 cm, CR = 3cm and AS = 5cm, then x = ______.

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