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

Round table

Do you know a cone? If you flatten out the top tip, you get a cone. He should be one of the pillars. The top view is two circles encased, and the main view is trapezium.

Set top radius to r, bottom radius to R, and height to h

Then V = (1/3)*π*h*(R^2 + Rr +r^2)

a cone size = (PI, high height, (Ra Ra, Rb + Rb ^ ^ 2 + 2) / 3)

侧 area = (π • (Ra + Rb) • 斜高)