Q. 45.0( 5 Votes )

A circle touches the side BC of ΔABC at P, AB and AC produced at Q and R respectively, prove that AQ = AR =( perimeter of ΔABC)

Answer :

Lengths of tangents drawn from an exterior point to the circle are equal.

From the above theorem,

AR = AQ …(1)

BP = BQ …(2)

CP = CR …(3)


Perimeter of ΔABC = AB + BC + CA

Perimeter of ΔABC = AB + BP + PC + CA

Perimeter of ΔABC = (AB + BQ) + (CR + CA) [Using (2) and (3)]

Perimeter of ΔABC = AQ + AR

Perimeter of ΔABC = AQ + AQ

Perimeter of ΔABC = 2AQ [Using (1)]

AQ = AR = 1/2Perimeter of ΔABC

Hence, Proved.

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