Length + length + width + width = perimeter.
Length + width x 2 = perimeter
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To find the area of a rectangle, you multiply the length by the width (one side by a different side) Or you could count how many centimeter squares make up the rectangle
If you are given the area you will have to think what do you times with the number you have to get it.
One rectangle that has a perimeter of 30 has a length of 5 and a width of 10.
The rectangle is 23cm x 16cmHalf the perimeter is 78 / 2= 39cm (which is one side and one end).39 - 7 = 32cm32 / 2 = 16cm (one end)16 + 7 = 23cm (one side)Proof:(23 + 16) x 2 = 78cm the perimeter.
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 .