11 sided irregular shape that tessellates

Question

My friend was fiddling around on the triangle when he created an irregular heptagon with it not able to tessellate.

He then asked me if I could create an 11 sided irregular polygon that is able to tessellate by changing a side AB. He told me there was 3 and that you can make 2 more without necessarily using the side AB. I have absolutely no idea what they are. Can I please have some help?

Answer 1

For: "create an 11 sided irregular polygon that is able to tessellate by changing a side AB":

which then becomes:

where I just a projected a duplicate triangle, using the axis of symmetry between side AB (to be changed) and side AC (the side with tessellation to be matched with). And there you have your shape. There are more you can make, take this example as a hint.

For: "you can make 2 more without necessarily using the side AB":

Here's another hint:

Good Luck!