Question

Prove that Radian is a constant angle.

Answer 1

Answer:

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Radian is a Constant Angle. ... If we take an arc AB = OA = r, then by definition, ∠AOB =1 radian. Let AO be produced to meet the circle at the point C. Then the length of the arc ABC half the circumference and ∠AOC, the angle at the centre subtended by this arc = a straight angle = two right angles

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