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Perimeter = length + length + width + width Let "w" = width, then "7w" must equal the length (because it's 7 times the width) 7w + 7w + w + w = perimeter 16w = perimeter
The width is half the length: The perimeter is twice the length plus twice the width. If the perimeter is 3 times the length, twice the width must be the length.
Perimeter minus two times the width will give you the two times the length. Area is found by multiplying the length by the width.
The perimeter is the length plus width times 2.