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Ab is a mirror arc in a circle with centre p. R is point on the major arc except a and b if angel APB= 150 then |
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Answer» Answer: ∠BAP=75 ∘ ∠OAP=90 ∘ ∴∠OAB=90 ∘ −75 ∘ =15 ∘ So, ∠AOB=180 ∘ −2(15 ∘ )=150 ∘ ∴Exterior∠AOB=360 ∘ −150 ∘ =210 ∘ So, ∠ACB= 2 1 (210 ∘ )=105 ∘ [Angle subtended by an arc at the centre is DOUBLE than the angle subtended by it at the REMAINING part of the CIRCLE]
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