Verified Answer :

We know, the measure of whole circle = 360
So, ACB = 360 - AOB
ACB = 360 - 30
ACB = 330

In short, Your Final Answer would be Option A

Hope this helps!

Apocrophon

Since the measure of a full circle is 360°, subtracting a section will be;
360° - AB = ACB
\(360-30=330\)
So the measure of ACB is 330°.

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