David M. answered 11/12/17
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Dave "The Math Whiz"
The perimeter is the length of all sides of an object added together. Seeing that you are talking about a square painting, a square means that all sides are of the same length. Therefore, a square has 4 sides with identical lengths. If we call the side of each length "X", then 4X must equal 260 centimeters.
4X = 260 equation we need to solve
X = 260/4 divide both sides by 4
X = 65 solve
Therefore, the length of each side is 65 centimeters.