It has 40 diagonals.
Improved Answer:-
Using the formula for diagonals of a polygon: 0.5*(442-132) = 902 diagonals
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There are 44 diagonals in an 11 sided undecagon
It is an undecagon which has 11 sides Check: 0.5*(112-33) = 44 diagonals
it has 44 diagonals :D
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
The sum of the interior angles of a polygon is 2n - 4 right angles, where n is the number of sides. For a 24 sided shape this gives (2 x 24) - 4 = 44 right angles = 3960°.