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The question is from the topic circles. It is a data sufficiency question. Finding the angle subtended by a chord at the centre would help. CAT Geometry questions are heavily tested in CAT exam. Make sure you master Geometry problems.

Question 32: Find ∠PRB. Given
I. ∠BPQ = 22 and O is the centre of the circle
II. ∠RBP = 54 and chord PQ is parallel to AB

CAT Question - Geometry - circles
  1. Either I or II individually is sufficient
  2. Both I and II together are required
  3. One of the statements alone is sufficient
  4. Need more data

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Explanatory Answer

Method of solving this CAT Question from Circles: Try to find the angle subtended by the chord PB at the center from the given statements!

Statement I
O is the centre implies AB is the diameter
∠BPQ = 22
Let us join OP and see what we get.
CAT Question - Geometry - circles
∠OPB = ∠OBP (Triangle OPB is isosceles)
If only we know ∠POB, then we can find the answer…

Statement II
∠RBP = 54
CAT Question - Geometry - circles
Chord PQ is parallel to AB implies ∠BPQ = ∠ABP
We definitely need one of the above angle to get some clue…
Let us combine both the statements
Since ∠BPQ = 22, ∠ABP = 22
∠POB = 180 – (22 + 22) = 136
∠PRB is nothing but the angle subtended by the chord PB and is half the angle at the center.
∠PRB = ∠POB / 2 = 136/ 2 = 68
We need both statements together to arrive at a solution!

The question is "Choose the correct answer"

Hence, the answer is Both I and II together are required.

Choice B is the correct answer.


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