Question

How many triangles can a heptagon be divided into

Answer 1

A heptagon can be divided into 5 triangles 

Answer 2

Do they all have be even? Well if they do have to be even, the most is at least seven, reason being, with every single polygon with even sides, all the triangles  are the same amount as their polygons sides. Reason number two it's seven, when all the lines in vertices meet up in the middle they equal seven.