Unless it is a rhombus (or square) you cannot.
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I don't think so.
A regular quadrilateral has its 4 sides of the same length. If the perimeter (sum of the 4 sides) is 36 it means one side is a fourth of that, or 9.
A regular pentagon with side length 26 cm has a perimeter of 26*5 = 130 cm. The three sides of the quadrilateral sum to 98.6 cm so the fourth side must be 130-98.6 = 31.4 cm.
57mm
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. ■