Quantitative Aptitude Ques 39

Question: 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.

Options:

A) $ \frac{20}{3},cm $

B) 20 cm

C) 3 cm

D) 4 cm

Show Answer

Answer:

Correct Answer: A

Solution:

  • Given, PQ = 8 cm, OP = 5 cm Then, in $ \Delta OPR, $ $ OR=\sqrt{OP^{2}-PR^{2}}=\sqrt{5^{2}-4^{2}}=3,cm $ Now, in similar $ \Delta TPO $ and $ \Delta PRO, $ $ \frac{TP}{PO}=\frac{RP}{RO} $
    $ \Rightarrow $ $ \frac{TP}{5}=\frac{4}{3} $

$ \therefore $ $ TP=\frac{20}{3},cm $