Question

write the formula to find the total surface area of a frustum of a cone​

Answer 1

The total surface are of a frustum is equal to-
Pi x r x l + Pi x (r1)*2 + Pi x (r2)*2

Answer 2

Answer:

total surface area of a cone

$\pi \: l(r + l)$

total surface area of a custom

$\pi \: l(r1 + r2) + \: {r1}^{2} + {r2}^{2}$