Divide the perimeter by 4 to get the length of a side. Then you can square that to get the area.
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The perimeter is 20*sqrt(2) cm = 28.2843 cm
A "square" is a figure that has four sides of equal length. To get its perimeter, you multiply any of the four sides by 4. If you mean a "quadrilateral" that has the stated sides, just add the sides together.
what is the perimeter of a 11cm x 10cm rectangle answer 42
The perimeter of 100 square in cm is 40cm. Each side is 10cm, you get 40 when you add the four sides.
10cm is a length. You can only find perimeter (length all the way round) if there is a shape!