total surface area of a frustum of a cone
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TSA of:
(1) cone : pie.r(l+r)
(2) Frustum : pie.l(r1+r2)+pier.rsq1+rsq2
(1) cone : pie.r(l+r)
(2) Frustum : pie.l(r1+r2)+pier.rsq1+rsq2
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