In the given figure, PQ is a chord passing through the centre 'O' of the circle. Calculate ∠PQS.

F1 SSC Arbaz 6-10-23 D2

This question was previously asked in
SSC CGL 2023 Tier-I Official Paper (Held On: 21 Jul 2023 Shift 4)
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  1. 40°
  2. 60°
  3. 20°
  4. 80°

Answer (Detailed Solution Below)

Option 3 : 20°
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Detailed Solution

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Concept used:

The sum of the opposite angles of the cyclic quadrilateral is 180°.

∠PSQ = 90° because the angle is in a semi-circle.

Calculation:

∠SPQ = 180° - 110°  = 70° (The sum of the opposite angles of the cyclic quadrilateral is 180°)

Now, In triangle PQS.

∠PSQ = 90° (Angle in semi-circle)

∠PQS = 180° - ( ∠PSQ +∠QPS)
 

⇒ 180° - (90° + 70°) = 20°

∴ The correct option is 3

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