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in Co-ordinate geometry by (63.5k points)

A polygon of nine sides, each of length 2, is inscribed in a circle. The radius of the circle is …..

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Here, central angle = 360º/9 = 40º

In ∆ ACM, 1/r = sin20º ⇒ r = cosec 20º

∴ Radius of circle = cosec 20º 

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