infinite
Improved Answer:-
The formula is: 0.5*(n2-3n) where n is the number of sides of the polygon
So: 0.5*(144-36) = 54 diagonals
20.
The name of a 20 sided polygon is Icosagon.
Yyghhii
A seven sided figure has 14 diagonals. Each vertices has 4 diagonals (but of course some are shared diagonals). The best thing to do is draw a regular heptagon, draw all the diagonals (lines connecting non-adjacent vertices) in pencil and then go back with a red or blue pen and count the diagonals as you trace each line in the different color. AA
In a polygon with n sides, we have n(n-3)/2 diagonals. In a convex polygon with n sides, you can draw n-3 diagonals from each vertex, but you are counting each one twice you so you need to divide by do. That is why we have n(n-3) divided by 2
20.
A 5-sided polygon is called a pentagon. You can draw up to 5 diagonals in a pentagon.
21
It depends if the polygon is convex or concave but if it is a regular polygon it would have 560
An equilateral triangle. ►
153 diagonals.
The name of a 20 sided polygon is Icosagon.
what is a regular polygon
Yyghhii
ಠ_ಠ
A ten-sided polygon is called a decagon.
Draw a nine sided polygon.