Question

Can someone please help me with this?

Answer 1

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!

Answer 2

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°.