# How to find out the volume of a hollow column

In this construction video tutorial, one can learn the quick process to estimate the volume of a hollow column in jobsite.

Given below, the dimension of the section plan :-

The height of the column is taken as 3 meter

Outer radius from center of the column is taken as R = 0.6 m = 600 mm

Internal radius is taken as r = 0.3 m

To determine the volume, the following formula is used :-

Volume = πR2h - πr2h

= πh (R2 – r2) = 3.14 x 3 (0.62 – 0.32) [ here value of π = 3.14]

= 2.543 m3

To get more details, watch the following video.

Video Source: SL Khan