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Even if you knew how many sides the polygon has, you stillcould not calculate its perimeter with that much information.Examples:-- An equilateral triangle with area of 20 has perimeter of 20.3885 .-- A square with area of 20 has perimeter of 17.889(rounded).-- A rectangle with area of 20 can have any perimeter more than 17.889 .4 by 5 . . . . area = 20, perimeter = 182 by 10 . . . area = 20, perimeter = 241 by 20 . . . area = 20, perimeter = 42..etc.
The area of circle with a circumference of 20 is: 31.83 units squared.
The area of a hexagon with a given side of 20 is 1,039
If you mean that the square has side equal to 20 cm, then the area is 20 x 20 = 400 square cm
Area = 45*20 = 900 square cm