You add up all of the sides of the rectangle.
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The perimeter of rectangle is the sum of the four sides of a rectangle.
The answer is 12 cm.
To find the perimeter of a rectangle you must calculate the lengths of each of the sides and add them all together.
156 It is impossible to calculate the area of a rectangle from its perimeter if no other dimension is known. The area of a rectangle is the product of its length and width, and the perimeter is twice the sum of its length and width.
Add together its 4 sides