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In the following figure, PQ is the diameter of the circle with centre O and QR is the tangent to the circle at Q.
PR intersects the circle at S and the tangent to the circle as S intersects QR at T.  If the diameter of the circle is 20 cm and TR=6 cm, find the approximate length of the line segment PR.


In The Following Figure, PQ Is The Diameter Of The Circle Wi...


Options:
A .   33.2 cm
B .   26.16 cm
C .   24.57 cm
D .   22.5 cm
Answer: Option D
:
D

In The Following Figure, PQ Is The Diameter Of The Circle Wi...


Clearly. PSQ=90 [Angle in a semi circle]
Also, TQ=TS [Tangents from an external point are equal ] ... (1)
Let TQS=TSQ=x
Clearly, TSR=90 - x
Also in ΔQSR, QRS=90-x
:.TR=TS ... (2)
From (1) and (2), QT=TR
Given that TR=6 cm.
QR=QR+TR =6+6=12cm
Now, the length of the line segment PR = PQ2+QR2
=202+122=544=16×34
=434 cm=22.5 cm 



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