if you're working with a rectangle, width = (perimeter - 2(length)) divided by 2
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Perimeter is Length + width x 2 or Length + length + width + width. This is perimeter for any shape including a rectangle. Perimeter of a rectangle is all sides added together for a rectangle.
The perimeter is the total distance around - width + width+ length + length.
call width x so length is 3x perimeter is (2*length)+(2*width) so perimeter is 8x
(2) Length + (2) Width = Perimeter
Perimeter: Add the length of the four sides. Area: Multiply length x width.