Question

10.
write formula to find total surface area of frustom of cone​

Answer 1

π * [ r12 + r22 + (r1 + r2) * √((r1 - r2)2 + h2) ]

Answer 2

A = π * (r12 + r22 + (r1 + r2) * s) = π * [ r12 + r22 + (r1 + r2) * √((r1 - r2)2 + h2) ]