Using the formula: 1/2*(n2-3n) whereas 'n' is the number of sides of the polygon
1/2*(n2-3n) where n is the number of sides of the polygon
The only polygon with no diagonal is the triangle.
By using the polygon diagonal formula or the quadratic equation formula in which in both formulae they work out that the polygon in question has 21 sides.
A concave polygon.
Concave quadrilateral.
It is a convex polygon.
A convex polygon
No, a diagonal is never a side of a polygon:A diagonal is a line between two non-adjacent vertices of a polygon;A side is a line between two adjacent vertices of a polygon.
a convex polygon
Finding the perimeter of a polygon is finding how far it is in total along all the edges of the polygon; whereas finding the area of a polygon is finding how much space the polygon covers. The perimeter of a polygon forms the boundary around the area of the polygon.
VX
Unless the polygon is a triangle, it is a diagonal.