There are many perimeter formulas, because there's a different one for each shape.
P= Perimeter
For a rectangle, if
L= Length and W=Width,
then
P= 2L plus 2W .
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Its perimeter is the sum of its 4 sides Its area is 0.5 times the product of its diagonals
The perimeter of a rectangle, like the perimeter of any closed two-dimensional figure, is the distance around it. The perimeter of the rectangle is the sum of two lengths plus two widths.
You need to first draw the diagram then you must determine your two formulas of area and perimeter like #=2L+2W and #=L•W and then you can use substitution from one formula to solve a single variable in the other formula.
They both depend on circumference not perimeter.
Perimeters = sum of sides added together