If one side is 10cm...
10 x 4 = 40cm
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It is: 4*8 = 32 cm
It is actually impossible to work out the square root of a shape but you can work out the square roots of the interior and exterior angles, the area and the perimiter
The area is the inside. The perimiter is around. If its a rectangle, to find the area you multiply the lengths of two sides
If the area is 36 square units, the square is 6 units by 6 units. The perimeter is 4 x 6 units = 24 units.