An equilateral triangle, rhombus, or any regular polygon - pentagon, hexagon, heptagon, ...
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It is the side of an isolateral figure.
It is the total length "outline" of a figure. For example, the total length of the outline of a square, its perimeter, is the total length of the four sides of the square.
Another square of the same size
use a measuring tape
width x length divided by 144 will give you square ft.