How many triangles can be formed with 6 matchsticks of equal size without breaking or overlapping them?
4 triangles if you arrange them in 3 dimension like a pyramid.
### Instruction: How many triangles can be formed with 6 matchsticks of equal size without breaking or overlapping them?
### Context: 
### Answer: 4 triangles if you arrange them in 3 dimension like a pyramid.</s>