Used in mathematics to describe a specific four-sided shape, not just any shape. In geometry class, the assignment was to list properties of various quadrangles.
Pro Tip 2/3
Four Angles
A quadrangle must have exactly four angles; no more, no less. Despite having four sides, if a shape does not have four angles, it cannot be a quadrangle.
Pro Tip 3/3
Sides Length
All sides can be of different lengths, unless it is a square or rectangle. In our shapes project, we created a quadrangle with two long sides and two short ones.