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प्रश्न
In the figure, O is the centre of the circle and ∠ACB = 40° then ∠AOB =
विकल्प
80°
85°
70°
65°
MCQ
उत्तर
80°
Explanation;
Hint:
∠AOB = 2∠ACB ...(The angle subtended by an arc of the circle at the centre is double the angle subtended at the remaining part of the circle.)
= 2 × 40°
= 80°
shaalaa.com
Theorem: The angle subtended by an arc of the circle at the centre is double the angle subtended by it at any point on the remaining part of the circle.
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