A quadrilateral is any 4 sided polygon. Therefore, quadrilaterals would include parallelograms, rectangles, squares, complex quadrilaterals as well as trapezium.
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They are called Quadrilaterals.
because they have four sides, which is the definition of quadrilateral
A quadrilateral has four sides, and so four quadrilaterals will have a total of 16 sides counted separately.
Quadrilaterals are things with four sides, like squares, rectangles, diamonds, trapezoids, rhombuses. Anything that doesn't have four sides (an infinite list) is a non-example of a quadrilateral.
Square, rectangle, rhombus and a trapezoid.