# A triangle PQR is drawn to circumscribe a circle of radius 6cm and QR is divided by the point of contact T. QT and TR are 12cm and 9cm respectively. If the area of Triangle PQR = 189 sq. cm, then find the lengths of sides PQ and PR. Please help me with this. Its very urgent. Thank you :-)

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by AkiraYo
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2015-03-11T18:07:06+05:30

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Since the triangle is circumscribing the circle, the circle is the incircle of the triangle. All the sides of the triangle are tangents to the circle.

Given RT= 9cm and QT = 12cm
Since RT and RU are tangents to a circle from a point R, they are equal
Thus RT = RU = 9cm
similarly, QT = QS = 12cm
Let PS = PU = x cm
radius of circle, r = 6cm

sides of triangle are:
PQ = (12+x) cm
QR = 12+9 = 21cm
PR = (9+x) cm

Given that area = 189cm²

thus 21+x = 31.5
⇒ x = 31.5 - 21
⇒ x = 10.5

Sides of triangle are:
PQ = (12+x) cm = 12+10.5 = 22.5cm
QR = 12+9 = 21cm
PR = (9+x) cm = 9+10.5 = 19.5cm
hey circumscribe means triangle inside circle
thnk u