In Fig. 9.19, AB is a diameter of the circle, CD is a chord equal to the radius of the circle. AC and BD when extended intersect at a point E. Prove that ∠ AEB = 60°.

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TextAngle Subtended by Arc at Centre is Twice Angle at CircleNCERT Textbook

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TextAngle Subtended by Arc at Centre is Twice Angle at Circle