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In a triangle ABC if a = 3, b = 4 and sin A = 3/4, then what is angle B equal to?

  1. π/4
  2. π/2
  3. π/3
  4. π/6

Answer (Detailed Solution Below)

Option 2 : π/2
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Detailed Solution

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Concept:

Sine Rule:

Where a, b and c are sides and A, B and C are angles.

Here; Side a faces angle A, side b faces angle B and side c faces angle C

Calculation:

Given:

a = 3, b = 4 and sin A = 3/4

sin B = 1

B = 90∘ = π/2

 

Additional Information

Cosine Rule:

cos A = 

cos B = 

cos C = 

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