find the number of diagonals in a 14 sides polygon

Question

can you help me wiht this?

Answer 1

i got 14
is that right?

Answer 2

The formula for finding the amount of diagonals in a polygon is n(n-3)/2.
So 14(14-3)/2 = 77 Diagonals

Or Im not sure if this is it

So for n=8, we have 8*5/2=20.

I think it's 77 but Im not sure.

Answer 3

Nope.

Study this site carefully.

http://www.mathopenref.com/polygondiagonal.html

Answer 4

I thought he was talking about a 14 sided polygon so it would have 77. When you go on that website you just gave and make the polygon have 14 sides it says 77. But Im not sure. :/

Answer 5

I think you're right, Rezu.