You add the lengths of all sides of the shape.
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To find the perimeter you add and to find the area we multiply.
You have to multiply to find area you have to add to find perimiter
you multiply the length by two then you multiply the width by two and then add the two answers 2l+2w
for area you multiply length times width and for perimeter you add all of the sides together
Perimeter = 2 x (length+width). You add the length to the width and multiply the sum by two.