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A quadrilateral is drawn to circumscribe …

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

Sia ? 6 years, 6 months ago

We know that the tangent segments from an external point to a circle are equal
 
{tex}\therefore{/tex}  AP = AS ........(1)
BP = BQ .......(2)
CR = CQ .......(3)
DR = DS .......(4)
Adding (1), (2), (3) and (4), we get
(AP + BP) + (CR + DR) = (AS + BQ + CQ + DS)
{tex}\Rightarrow{/tex} AB + CD = (AS + DS) + (BQ + CQ)
{tex}\Rightarrow{/tex} AB + CD = AD + BC

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