Question 1076154
Try drawing the first few simple regular polygons and draw and count the number of diagonals of each.


n number of sides
d number of diagonals


<pre>
<u>n</u>        <u>d</u>
3        0
4        2
5        5
6        9
7       14
</pre>
NO such regular polygon will have 12 diagonals.
No convex polygon will have 12 diagonals.