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Question

In the given figure, PQ is a chord of length 8 cm of a circle of radius 5 cm. The tangents at P and Q intersect at a point T. Find the length TP.

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Solution


Join OP and OT

Let OT intersect PQ at a point R.

Then, TP=TQ and PTR=QTR.

TRPQ

and TR bisects PQ.

PR=RQ=4 cm.

Also OR=OP2PR2=5242 cm

=2516 cm=9 cm=3cm.

Let TP=x cm

and TR=y cm

From right ΔTRP, we get

TP2=TR2+PR2

x2=y2+16

x2y2=16(i)

From right ΔOPT, we get

TP2+OP2=OT2

x2+52=(y+3)2 [OT2=(OR+RT)2]

x2y2=6y16(ii)

From (i) and (ii) , we get

6y16=166y=32y=163

Putting y=163 in (i) we get

x2=16+(163)2=(2569+16)=4009

x=4009=203

Hence , lenght TP=x cm=6.67 cm


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