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The radius of a circle is 9 cm. Find the length of an arc of this circle which cuts off a chord of length

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The radius of a circle is 9 cm. Find the length of an arc of this circle which cuts off a chord of length equal to length of radius.

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Here, r = 9cm 

Let the arc AB cut off a chord equal to the radius of the circle. 

Since OA = OB = AB, 

ΔOAB is an equilateral triangle.

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