AB is the diameter of a circle with centre O. C and D are two points on the circle on either side of AB, such that ∠CAB = 52° and ∠ABD = 47°. What is the difference (in degrees) between the measures of ∠CAD and ∠CBD?

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SSC CGL 2021 Tier-I (Held On : 21 April 2022 Shift 2)
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  1. 25
  2. 15
  3. 10
  4. 20

Answer (Detailed Solution Below)

Option 3 : 10
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Detailed Solution

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Given:

∠CAB = 52° and ∠ABD = 47°

Concept used:

The angle subtended by the diameter at any point on the circumference is equal to 90°

Calculation:

F2 Savita SSC 7-9-22 D2

According to the concept,

∠ACB = ∠ADB = 90°

So, ∠CBA = 180° - (90° + 52°)

⇒ 180° - 142°

⇒ 38°

Similarly,

∠BAD = 180° - (90° + 47°)

⇒ 180° - 137°

⇒ 43°

So, ∠CAD = 52° + 43°

⇒ 95°

∠CBD = 38° + 47°

⇒ 85°

Now,

∠CAD - ∠CBD = 95° - 85°

⇒ 10°

∴ The difference (in degrees) between the measures of ∠CAD and ∠CBD is 10.

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