Question: how to find the surface area of donut?
Answer: Surface Area. The surface area of a Torus is given by the formula – Surface Area = 4 × Pi^2 × R × r. Where r is the radius of the small circle and R is the radius of bigger circle and Pi is constant Pi=3.14159.
Volume. The volume of a cone is given by the formula – Volume = 2 × Pi^2 × R × r^2.