Question

How many diagonals are there if the regular convex polygon has n sides ?

Answer 1

@Numb3r1 @ajprincess

Answer 2

n sides means n corners. Tell me the squares and I'll fill in more.

Answer 3

@Numb3r1 @ajprincess

Answer 4

Fine, but only because I need to go to bed.

Answer 5

n corners, each of which can create a diagonal with all of the other corners... except the two adjacent ones and itself.

Answer 6

So we have n(n-3) potential diagonals.

Answer 7

But wait!

Answer 8

Each diagonal is being counted twice in that example. You can figure the rest out.

Answer 9

Thank you sir