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The sum of the angles of a regular n-sided polygon is equal to (n - 2) x 180 degrees.

Therefore, the sum of the angles of a regular 40-sided polygon (tetradecagon) is equal to (40 - 2) x 180 = 6840 degrees. Therefore, 6840 refers to the sum of the degrees, not the number of diagonals.

The number of diagonals of an n-sided polygon is given by n(n-3)/2. So a 40-sided polygon has 40*37/2=740 diagonals.

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Q: Does a 40 sided polygon have 6840 diagonals?
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