In each triangle, make a small slit in the middle of the base of the triangle. This allows you to roll the triangles into a crescent shape.
Using both hands, roll the triangle into a crescent by rolling from the base up. One hand should be working with the dough on each side of the slit. A tip to get perfect crescents is to point your hands away from each other as you roll. This will make the classic shape that we're all familiar with. They look so cute!