Question

7. In the figure, O is the centre of the circle. What is the measure of ZACB?
(i) 45°
(ii) 60°
(iii) 70°
(iv) 90°
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Answer 1

so to find the measure of ZACB , the steps are

as the given angle is 120° and from the linear pair

it would be 180° - 120° = 60° hence it is 60° and therefore your answer is the 2nd option which is 60°