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A polygon is any contained shape made up of any number of straight lines. A quadrilateral is any polygon which has four sides. So we want a shape made of straight lines which doesn't have four sides. One example of this would be a triangle. Another example would be a pentagon. Another still would be a hexagon.
A quadrilateral is a 4 sided polygon with one flat face
540 The polygon with 5 side is called a pentagon. Pentagon can be divided into one triangle and a quadrilateral or three triangles. Both of these equal to 540 because the sum of the interior angle of a triangle is 180 and 360 for a quadrilateral.
There is no special name for such a shape.
all i know is that its definitely a quadrilateral