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# Please help me with the math question! TIA ?

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- PopeLv 72 months ago
If that is a circle with center O, then ∠AOB is the central angle of arc ACB.

∠AOB = arc ACB = 60°

Radii OA and OB are equal, so the opposite angles in ∆AOB are equal.

∠BAO = ∠ABO

∠BAO + ∠ABO + ∠AOB = 180°

∠BAO + ∠ABO + 60° = 180°

∠BAO + ∠ABO = 120°

∠BAO + ∠BAO = 120°

∠BAO = 60°

- Anonymous2 months ago
Something is wrong with the question. "Arc ACB" means a distance (arc length), not an angle. So you can't say it equals 60degrees.

And in any case, angle ACB is shown over 90degrees and can't possibly be 60degrees.

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