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2015-12-20T12:46:32+05:30

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Area of circle = 81 π cm²
⇒π r² = 81 π
⇒ r² = 81
r = 9 cm
now length of arc = (2π r)× (π/3)/(2 π)
                             =  π r/3
                             = π × 9 /3
                             = 3π 
∴ so length of arc subtending angle π/3 = 3π
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2015-12-20T14:40:40+05:30
Area = pi ( r )^2 = 81 ( pi ) => r = 9 cm

( arc length ) = ( angle subtnded ) * ( radius )

=> arc length = (pi / 3) * 9 = 3 ( pi ) = 3 * 3.1415 cm
= 9.4245 cm
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