Sister's math problem X-post

[J_V]

My sister is trying to pass this basic math course with this really annoying teacher and the only way she is going to do it is if she gets the extra credit. The only hitch is you have to get all the problems totally correct or you get no credit. This is the only one that is simple for me. If you guys could help, it would make my day [img]/images/graemlins/smile.gif[/img]. It's not really a math problem.




How many triangles are in this diagram?

And yes, it really is my "sister's" [img]/images/graemlins/smile.gif[/img].

Is there a mathematical way to solve this? Maybe one of you google experts could find the answer for me. I found nothing, but I'm no google expert.