It means a plane shape formed by four straight sides.
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Four-sided polygon.
you mean a quadrilateral and,a square...
Lateral means side, quadrilateral (4 sides)
If you mean a quadrilateral shape then it is any shape that has 4 sides.
You don't. There is no such thing as the "sum of a quadrilateral". If you mean the perimeter, you add the lengths of the four sides. If you want the area, you can divide the quadrilateral into two triangles, or some other shapes, calculate the individual pieces, and add everything up.