it depends on the question really. Generally, a side length is how long a specific side of something is.
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We have no idea what "a 144cm square" means. If you mean to say "a square with an area of 144 square cm", then its side length is 12 cm.
Most commonly, the longer side is the length.
Perimeter of a triangle = (length of the first side) plus (length of the second side) plus (length of the third side)
You divide the length of the shortest side by the length of the longest side.
Multiply (the length of one side) by (the length of one side).