12
=)
Improved Answer:-
It has 14 because the formula of 0.5*(49-27) = 14 diagonals
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Yes, a 7 sided shape is a heptagon.
it is called a seven sided shape in Canada
The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
A seven-sided shape (polygon) is called a heptagon.
Septagon