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.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: How many triangles can be formed with 6 matchsticks of equal size without breaking or overlapping them?
### Input: 
### Response: 4 triangles if you arrange them in 3 dimension like a pyramid.