If 2sin A - 1 = 0 and A is an acute angle, the measure of angle A is : 1. 30° 2. 45° 3. 60° 4. 90°

2sin A - 1 = 0 ⇒ 2sin A = 1 ⇒ sin A = ⇒ sin A = sin 30° ⇒ A = 30° Hence, option 1 is the correct option.

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Mathematics

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2sin A - 1 = 0

⇒ 2sin A = 1

⇒ sin A = $\dfrac{1}{2}$

⇒ sin A = sin 30°

⇒ A = 30°

Hence, option 1 is the correct option.

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