In the given figure, a circle touches all the four sides of a quadrilateral ABCD whose three sides are AB = 6 cm, BC = 7 cm, CD = 4 cm. Find the length of AD.
10cm
11cm
13cm
3cm
A
10cm
B
11cm
C
3cm
D
13cm
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Solution
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AS and AP are tangents drawn from A to the circle
⟹AS=AP
Similarly
DS=DR,RC=CQ,QB=BP
AB=AP+PB=6
AP=6−PB
BC=BQ+QC=7cm
CD=CR+DR=4cm
AD=AS+SD=AP+RD
=(6−PB)+(4−CR)
=10–(PB+CR)
=10–(BQ+CQ)=10−BC
=10–7=3cm
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