Formula of regular polygon diagonal
The n-sided polygon has $\frac{ n (n-3) }{ 2 }$ diagonals.
| Sides | Diagonals |
|---|---|
| 3 | 0 |
| 4 | 2 |
| 5 | 5 |
| 6 | 9 |
| 7 | 14 |
| 8 | 20 |
| 9 | 27 |
| 10 | 35 |
| 11 | 44 |
| 12 | 54 |
\[ d = \frac{ n (n-3) }{ 2 } \]
d: Number of diagonals
n: Number of sides
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