Traditional Culture Encyclopedia - Hotel franchise - There are four columns of the same size in the hotel lobby that need painting. The cross-sectional radius of the column is 0.4 meters high.

There are four columns of the same size in the hotel lobby that need painting. The cross-sectional radius of the column is 0.4 meters high.

First, find a cylindrical lateral area.

Namely, (0.8 * 3.14) * 5 =12.56,

Then use lateral area to remove it, that is.

12.56/5 = 2.512kg

That's why so much paint is needed.