The answer will depend on what information you have.
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The formula for calculating development surface area of a truncated cone is Avr = π [s (R + r) + R^2 + r^2]. The solution is area (A) subscript r where r is the radius of the top of the truncated cone. In this formula R stands for the radius of the bottom of the cone and s represents the slant height of the cone.
find the surface area of the cone and add it to the surface area of the base so the formula would be pi radius s plus pi radius squared
This is how you do it: Area = C(pi)r + (pi)r2 Where: C = the side length of the cone r = radius of the base (pi)r2 = the base of the cone C(pi)r = outside of cone
pi * r * s, where r is the radius of the base and s is the distance along the edge of the cone from the top to the base (not the height).
Curved surface area of a cone = pi*radiud*length of slant