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Write the foumula to calculate the curve...

Write the foumula to calculate the curved surface area of the frustum of a cone .

A

`pi (r_(1) + r_(2))l`

B

`pi (r_(1) + r_(2) )h`

C

`pi(r_(1) - r_(2))l`

D

`pi (r_(1)- r_(2))h`

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