Not sure about a septagon, but there are 14 diagonals in a heptagon.
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There are 14 diagonals in a septagon. Another name for a septagon is heptagon. This is a seven-sided polygon. To figure the numbers of diagonals, you can use the formula 1/2 x [n x (n-3)], where n is the number of sides.
2 diagonals
It has 2 Diagonals!!!
It has 27 diagonals
14 diagonals