The question cannot be answered because it makes no sense. The perimeter - of a shape - is the outline of the shape. The is no unit in 20 outlines. Unless you count an outline as a unit and in that case, there are 20.
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Perimeter is the distance around an object. If the perimeter in some unit is 20, then that's the number of units.
Perimeter: 15+20+25 = 60 units
5 units x 5 units
Perimeter: 2(4+5) = 18 units Area: 4*5 = 20 square units
A 6 by 4 rectangle will have a perimeter of 20 units
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.