In quadrilateral PQRS, the bisectors of ∠R and S meet at the point T (inside the quadrilateral) and STR = 87.5°. If the ratio of P to Q is 2 ∶ 3, then what is the difference between the measures of Q and P?

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RRB Group D 12 Sept 2022 Shift 2 Official Paper
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  1. 45°
  2. 40°
  3. 35°
  4. 25°

Answer (Detailed Solution Below)

Option 3 : 35°
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Detailed Solution

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Given

∠STR = 87.5°.

The bisectors of ∠R and ∠S meet at the point T

The ratio of ∠P to ∠Q is 2 ∶ 3

Calculation

F2 SSC Savita 25-01-24 D1

∠P + ∠Q + ∠R + ∠S = 360

∠P + ∠Q = 360 - (∠R + ∠S)  ..(1)

∠STR + ∠R/2 + ∠S/2 = 180

2∠STR = 360 - (∠R + ∠S)  ..(2)

Put 2 in 1.

∠STR = (∠P + ∠Q)/2

∠P + ∠Q = 87.5 × 2 = 175°

(2 + 3) → 175°

1 → 175°/5 = 35°

The difference between the measures of ∠Q and ∠P is 35°.

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