It is a 42 sided polygon and has: 0.5*(422-(3*42)) = 819 diagonals
38 diagonals
5693
If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed
4
3
9 diagonals
9 diagonals
how many triangles are formed when any parallelogram and it diagonals are drawn
An octagon has 16 diagonals.
38 diagonals
0.5*(82-24) = 20 diagonals
Four sided quadrilaterals have two diagonals.
8
5693
If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed
It is 18 diagonals
You can draw 9 diagonals inside a hexagon.