Question

A circle is inscribed in a quadrilateral ABCD where ∠B = 90. If AD = 24 cm,
AB = 30 cm and DS = 8 cm, find the radius ‘r ‘ of the circle.

Answer 1

hey here is your answer

Given: AB=30cm AD=24 cm DS= 8 cm   (let here S = G,in the diagram) To find: r solution: 1) AH=AE 2) DG = DH                              ( tangents from an external point are equal) 3) CG  = CF4)BE=BF let O be the centre of the circlejoin O to E and O to F thus we can say that OEBF   is a square.(angle B=900,BE=BF, OE=OF{radii} ) now, 5)DH=DG=8 cmAD=24 AH=24-8 AH= 16 cm from equation 1, AE= 16 cm now, AB= 30 cmBE = 30-16 BE=14 cm since we know that OEBF is a square, all sides will be equaltherefore, OE=OF=BE=BF= 14 CMtherefore radius of circle is 14cm

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