It depends on whether you are counting the large main trriangles or counting all of the other triagles formed when drawing the just the Maine triangles. I counted 8 main triangles in a regular eneágono.
the answer is pyramid
There are 15 triangles in a 17-agon
15 triangles
15 triangles!!!!!!!!!!
There are 24 because 26-2 = 24
A heptagon has 5 triangles.
7 triangles
There are 7 triangles in a nonegon
There are 11 triangles in an undecagon. The number of sides of a polygon is the number of triangles it has.
It has 23 triangles
It has 34 triangles
4 right triangles