8
An octogon contains 6 equilateral triangles.
1
Join them together
6 straight lines drawn inside of an octagon will divide the octagon into 8 triangles
There are 6 triangles in an octagon
8
There are 6 triangles in an 8 sided octagon
An octogon contains 6 equilateral triangles.
Join the 6 triangles like pizza slices
1
There are six triangles in an octagon. In any convex polygon, there are two less triangles than the number of sides. So a octagon which has 8 sides, contains 6 triangles.
Join them together
There are 6
6 straight lines drawn inside of an octagon will divide the octagon into 8 triangles
Sort of depends on how the two triangles are beforehand. One nice way to make four equilateral triangles from six matchsticks is to make a tetrahedron (a triangular pyramid).
8-2 = 6 triangles