Question

 In the figure, O is the centre of the circle. What is the measure of ∠ACB?

       (i) 45°

(ii) 60°

(iii) 70°

(iv) 90°



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Answer 1

Answer:

The answer is 60°

hope you help

Answer 2

Answer:

iii) In the figure, O is the centre of the circle. The measure of ∠ACB is 70°.

Step-by-step explanation:

OA = OC (radius of circle)

So ∠OAC = ∠OCA

If ∠ AOC = 120° then

∠OAC = ∠OCA = 30° ------ (1)

If OC = OB (radius of circle)

So ∠OCB = ∠OBC

If ∠COB = 100° then

∠OCB = ∠OBC = 40° ------ (1)

Now ∠ACB = ∠ACO + ∠BCO

= 40° + 30° (from (1) and (2))

∠ACB = 70°