However long you want it. Not much detail.
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Only if you know what kind of polygon you have. If you know that you have a hexagon and one side is 1 cm, the perimeter is 6 cm. You only have to know the length of one side, since a regular polygon has equal sides. Perimeter or a regular polygon is the length of each side times the number of sides. You need to know both pieces to find the perimeter. ■
If there is regular polygon(having equal sides), then perimeter is L*N where L is length of side and N is no. of sides. If polygon is not regular then may Perimeter is equal to sum of all sides, if size of each side is known.
There are 5 sides (a pentagon). The perimeter is the length of one side times the number of sides. x * 2.5 = 12.5 and x is 5
It depends. If the shape is a regular polygon (square, pentagon etc), multiply the number of sides by the length of one side. If it's an irregular polygon, add the lengths of each side together to find the perimeter.
The area of a regular polygon with n sides is the half of the product of its perimeter and the apothem. So that you do not have enough information to find the area of the polygon (for example how many sides it has, or the side length).