#1**0 **

Please just put one question per post.

I will help you by displaying the first one properly.

You can make new posts for the other two.

Melody Mar 19, 2020

#2**0 **

All I have so far is that the angle is 45+Beta

Where beta is the middle size angle of the congruent triangles.

I have not worked out what the exact size of beta is.

Melody Mar 19, 2020