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The area of the lateral surface of a truncated cone with the radius of the lower base R = 2, with the radius of the upper base r = 1165, and the generative L = 970 equal to 3556146.585

What needs to be found:
Radius R: Radius r: Forming L:

truncated cone

A truncated cone is a part of a cone located between its base and a secant plane parallel to the base.
The formula of the area of the lateral surface of the cone Formula for the area of the lateral surface of a truncated cone truncated cone where R is the radius of the lower base,r is the radius of the upper base, L is the length of the generatrix.

Solution:
S = πL·(R+r)
= π·970·(2+1165)
= π·970·1167
= 1131990·π
=
3556146.585

a: The area of the lateral surface of a truncated cone with the radius of the lower base R = 2, with the radius of the upper base r = 1165, and the generative L = 970 equal to 3556146.585