∠ACB is inscribed in semicircle ACB of a circle with centre O then m∠ACB = A) 180

B) 360

C) 90

D) 45​

c) 90°

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[C] 90°.

It is Because ∠ACB is formed by the diameter of the semicircle.

And we already know that, the angle formed by diameter measure 90° to the circle or semicircle.

∠ACB is inscribed in semicircle ACB of a circle with centre O then m∠ACB = 90°.

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