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A, B, C are any points on the circle with centre O. If m(arc BC) = 110° and m(arc AB) = 125°, find measure arc AC.

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#### Solution

m(arc AB) + m(arc BC) + m(arc AC) = 360° ......[Measure of complete circle is 360°]

∴ 125° + 110° + m(arc AC) = 360°

∴ m(arc AC) = 360° – 125° – 110°

= 125°

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