Volume of cone = (π • r² • h) / 3 lateral area = (π • r • slant height)

Round table

Do you know a cone? If you remove the top point horizontally, you get a truncated cone. It should be a cylinder. The top view is two circles nested, and the front view is a trapezoid.

Let the radius of the upper base be r, the radius of the lower base be R, and the height be h

Then V＝ (1/3)*π*h*(R^2 + Rr +r^2)

Volume of a frustum = (π • height • (Ra^2 + Ra • Rb + Rb^2) / 3)

Lateral area = (π • (Ra + Rb) • Slope height)