for example a 5-inch square has a perimeter of 20 inches and you get that by adding all the sides up (5+5+5+5=20)
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Add together the 4 sides
The area is the inside. The perimiter is around. If its a rectangle, to find the area you multiply the lengths of two sides
21
2*l+2*22/7*r
If one side is 10cm...10 x 4 = 40cm