12.
There is actually a better answer and much larger answer than 12. The real answer is 54. Just because a dodecagon has 12 sides doesn't mean it has 12 diagonals because you can go either which way. To get a answer for this you can: 1. Multiply 12 and 9. You should get 108. 2. Then divid it by 2. You should get 54.
That is correct: The general rule for a polygon with n sides is that it has n*(n-3)/2 diagonals.
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
12-3 = 9
A dodecagon is a polygon with exactly 12 sides.A dodecagon has 12 sides.12
The interior angles of a dodecagon add up to 1800 degrees.
10
A regular 12 sided dodecagon has 54 diagonals.
A dodecagon has 1/2*12*(12-3) = 54 diagonals.
6
There are 54 diagonals in a 12 sided shape
i think it is 54
54
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
it's a 12 sided shape and it has 54 diagonals :D
It is: 0.5*(144-36) = 54 diagonals
12-3 = 9
The formula is: 0.5*(n2-3n) = number of diagonals when n is the number of sides of the polygon
A polygon with n sides has 1/2*n*(n - 3) diagonals. So, for a polygon, with n = 12, there are 54 diagonals.