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  1. An angle in a semicircle is
    1. 45°
    2. 60°
    3. 90°
    4. 120°
Correct Option: C

According to question , The angle at the semi-circle is right angle.

The angle subtended at the centre by an arc is double to that at the circumference.
For arc ADB
∠AOB = 180°
∴ ∠ACB = 90°


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