Question 126362
A quadrilateral is any 4-sided figure.  Trapezoids, parallelograms, rhombi, rectangles, and squares are all special cases of a quadrilateral.  But it doesn't matter what the individual interior angles are, they always add up to 360 degrees.


In fact, any polygon has a sum of interior angles equal to {{{180(n-2)}}} where n is the number of sides.  For a quadrilateral, n = 4, so {{{180(2)=360}}}.