Regular polygon is equilateral and equiangular.
Irregular polygon is non-equilateral and non-equiangular.
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Yes. A tetrahedron is a closed 3-d shape with 4 triangular faces. In a regular polygon, each of these is an equilateral triangle.
A non regular or irregular polygon is a polygon whose sides are not all the same length
An isosceles triangle or a rhombus.
In a non-convex (or concave) polygon, at least one interior angle is a reflex angle. An alternative definition is that if you take any two points inside a conves polygon, the line joining them is wholly inside the polygon.
Any polyhedrons such as a cube is a non polygon