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
All the sides of a regular polygon have the same length. If two or more sides of a polygon have different lengths, then the polygon is not regular.
A polygon is 2 dimensional shape whereas a non polygon can be 3 dimensional shape
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
A regular polygon is a polygon whose sides are equal length and whose angles are all the same value. A non regular polygon is just the opposite of a regular polygon.
The ogive never close because they represent non-decreasing functions, and polygon you close it.
a polygon in which the sides are not all the same length
A circle is non-polygon. Meaning it has a curved side. A circle has no sides. It is non-regular.
A polygon is convex if you can take any two points inside the polygon and connect them with a line segment that is completely contained by the polygon. A non-convex polygon is one which contains at least two points such that the line joining them does not lie entirely inside the polygon.
Not all polygons are regular by definition. An irregular polygon may have non-congruent sides or non congruent angles or both. A regular polygon will always have both congruent sides and angles.
All the sides are not equal
An isosceles triangle or a rhombus.