How do you find the total area of a flat box in math?

Answer 1

First of all, there's probably no other way to find it except with math.

-- Add up:

(length of the box times width of the box) plus

(length of the box times height of the box) plus

(width of the box times height of the box).

-- Double the result.

-- You have the total area of the cardboard used to make the box, including its top.