Figuring you meant FIND perimeter, the formula is P=2L + 2W (L is length, W is width)
Also, you can add up all the sides and then you'll get the perimeter
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The concept of a perimeter does not make sense for a solid object.
it means make same shapes only perimeter
Bigger than what ? Smaller than what ? If you have a certain perimeter and you want to cram the most area inside it, or if you have a certain area and you want to enclose it in the shortest perimeter, then you must make the perimeter circular. If you have only a limited number of fence posts and a circular perimeter isn't practical, then you make the perimeter square.
In the case of a rectangle, you would maximize the area given the perimeter by making the dimensions equal. In other words, you would make the rectangle into a square. However, to truly maximize the area, you would make the perimeter a perfect circle.
make a rectangle that covers 8 square units inside and has a perimeter of 12 units around the outside