6
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No!
The number of diagonals in a polygon with n sides is 1/2*n*(n - 3). So when n = 7 this gives the number of diagonals in a heptagon is 14.
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There are 14 diagonals in an heptagon
Improved Answer:-It has 14 diagonals
A 7 sided septagon or heptagon has 14 diagonals
14.
A heptagon can have 7 lines of symmetry but it need not have any. It will have 7*(7-3)/2 = 7*4/2 = 14 diagonals.