A, B, C are any points on the circle with centre O. m(arc BC) = 120∘ and m(arc AB) = 130∘.
Then, find m(arc ABC), m (arc ACB), and m (arc BAC).
A
None of the above
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B
240∘, 250∘, 220∘
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C
250∘, 230∘, 240∘
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D
240∘, 250∘, 240∘
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Solution
The correct option is C 250∘, 230∘, 240∘ By property of sum of measure of arcs, we must have
m(arc ABC) = m(arc AB) + m(arc BC) ⟹ m(arc ABC) = 130∘ + 120∘
= 250∘
m(arc AC) = 360∘ - m(arc ABC) ⟹ m(arc AC) = 360∘ - 250∘
= 110∘