A duodecagon has twelve sides and twelve corners. A duodecagon is usually called a dodecagon.
12
12
Not sure about a duodecagon, but a regular dodecagon has 12 axes of symmetry.
12
how many diagonals from a vertex a heptagon have
It has 1,345,890 diagonals
24 diagonals
2 diagonals
It has 2 Diagonals!!!
There are 20 diagonals
20 diagonals