Hexaflexagons are the hexagon shaped flexagons, as you might have guessed. First we shall make the trihexaflexagon. This is because you can turn it inside out to reveal one hidden face to accompany the 2 visible faces. Here is a photo of one that I made earlier:
Here's how to make one: get a strip of paper and mark it into ten equilateral triangles. There should be two right-angled triangles left over. Cut these out. Now, then, mark on the thick lines as shown:
Then position it like this:
Then fold along the first thick line on the left, like this:
Then fold inwards along the next thick line, like this:
Now tuck one triangle under the other, as shown in the next few diagrams:
Then put glue on the place that is under the triangle that is jutting out from the hexagon.
Fold the triangle that is jutting out from the hexagon over the glue(or fold outwards on the very last thick line). You've finished the trihexaflexagon!