👉 The term "nonequilateral" can be defined as a polygon that has three sides of equal length but no two sides are parallel. In other words, it is a polygon with four sides where all the angles are right angles (90 degrees), and no two sides intersect at any point. It's important to note that nonequilateral polygons are not symmetrical like equilateral or regular polygons. They can have more than one type of symmetry, such as internal or external symmetry.