Question

a polygon has 9 sides. how any diagonals does it have?


27?

Answer 1

yes you can use this formula
\[\frac{n^2-3n}{2}\]

Answer 2

thnx

Answer 3

Or you can do it manually if you didn't know that formula.

Answer 4

that's how i did it, i rew it out

Answer 5

It's a useful formula though. Good to remember. Tomas A is weird for remembering it, lol

jk

Answer 6

lol not weird, talented in other ways. takes all types to make the world go round.

Answer 7

7 + 6 +5 +4 + 3 + 2

Answer 8

well if it was 123531 polygon better use formula and you don't need to remember you can create it by analysing smaller polygons :P