To get the perimeter, you need to add the lengths of the sides.
In the case of a rectangle, with length L and width W, this simplifies to 2*(L+W).
In the case of a square, where each side is of length L, it simplifes further to 4*L
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Rectangle area, square metre = (rectangle length, metre) x (rectangle width, metre)
4 times the length of its side.
You an calculate the area of a rectangle by multiplying length x width.
By adding the lengths of the 5 sides together.
4 by 4 units