O is the incentre of the triangle PQR. If angle POR = 140 degree, then what is the angle PQR?

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SSC CGL 2022 Tier-I Official Paper (Held On : 02 Dec 2022 Shift 4)
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  1. 40 degree
  2. 140 degree
  3. 100 degree
  4. 70 degree

Answer (Detailed Solution Below)

Option 3 : 100 degree
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SSC CGL Tier 1 2025 Full Test - 01
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Detailed Solution

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Given:

POR = 140 degree

Concept used:

The incenter of a triangle is equally inclined to all the sides of the triangle.

Angle at incentre = 90° + vertex angle/2

Calculation:

According to the concept,

90° + ∠PQR/2 = 140°

⇒ ∠PQR/2 = 140° - 90°

⇒ ∠PQR/2 = 50°

⇒ ∠PQR = 100°

∴ The angle PQR is 100°.

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