A polygon with n sides has n(n-3)/2 diagonals.
A heptagon has 7 sides giving it 7(7-3)/2 = 14 diagonals.
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There are 5 diagonals
O.5*(49-21) = 14 diagonals
An heptagon has 7 sides and 14 diagonals
A seven sided figure has 14 diagonals. Each vertices has 4 diagonals (but of course some are shared diagonals). The best thing to do is draw a regular heptagon, draw all the diagonals (lines connecting non-adjacent vertices) in pencil and then go back with a red or blue pen and count the diagonals as you trace each line in the different color. AA
A heptagon has seven sides, so when drawing diagonals from one vertex, it will create five triangles. This is because each diagonal drawn from a single vertex will create a triangle until it intersects the previous diagonal. Therefore, the number of triangles formed by drawing all diagonals from one vertex in a heptagon is five.