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.
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It depends on what shape you are talking about.
Times the length by the width
length times width
look it up in a math book
math and arithmetic