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.
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In a quadrilateral the sum of all four angles equals 360º.
There's no such thing as a "triangle quadrilateral".The sum of the interior angles of a triangle is 180 degrees,and for a quadrilateral it's 360 degrees.
The sum of the 4 interior angles of any quadrilateral add up to 360 degrees.
The sum of all the angles in a quadrilateral always add up to 360 degrees. Hope that helps!!!!
The sum of the four sides of a quadrilateral is equal to its perimeter.