All quadrilaterals have 4 sides
No because a quadrilateral is a 4 sided 2 dimensional polygon whereas a pyramid is a 3 dimensional polyhedron
a polygon is a figure with more than 2 sides which forms a closed figure. so simply it can have as many sides as u want as long as u have at least 3. a quadrilateral is a 4 sided figure.
11
Quadrilateral
A 4 sided quadrilateral has 2 diagonals.
A simple polygon is a closed, straight-sided figure in which the sides do not overlap.
If it is a 2-dimensional figure, it is a polygon.
30
Yes and it is also a four sided quadrilateral
A polygon with n sides has n*(n-3)/2 diagonals. Simple as that. So a 9 sided polygon has 9*6/2 = 27 diagonals.
It is a plane (2-d) figure defined by N straight sides. An N-sided polygon is used to make statements which depend only on N and not any further details of the shape. For eaxmple, the interior angles of an N-sided polyogon add to (N-2)*180 degrees. This statement is true for all N greater than 2. It does not matter whether you are talking about a triangle, a quadrilateral, a pentagon, etc.
There is no such thing as a 2-sided polygon.