3
27 triangles. There are 16 one-cell triangles, 7 four-cell triangles, 3 nine-cell triangles, and 1 sixteen-cell triangle.
9-2 = 7 triangles
A nine sided shape has 7 triangles
7
3
7 triangles
27 triangles. There are 16 one-cell triangles, 7 four-cell triangles, 3 nine-cell triangles, and 1 sixteen-cell triangle.
There are 7 triangles in a nonegon
It depends on the dimensions of the 7 shapes.
It can have 5 triangles
9-2 = 7 triangles
A nine sided shape has 7 triangles
7
It can form 7 triangles
7
A 7 sided heptagon contains 5 triangles.