cone volume = (π • r² • h) / 3 side area = (π • r • slant height)

round platform

do you know cones? eliminate the top points horizontally to form a truncated cone. he should be a cylinder. the top view is two circles inside, 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 truncated cone = (π • height • (ra^2 + ra • rb + rb^2) / 3)

side area = (π • (ra + rb) • slope height)