All quadrilateral shapes have 4 sides
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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.
Two sides of a quadrilateral can be parallel.
number of sides of a quadrilateral= 4
yes it is possibe for a quadrilateral to have no equal sides
A quadrilateral always has 4 sides... no more no less.