What is the relationship between  $a\degree$  and  $b\degree$  ?

What is the relationship between  $d\degree$ and  $f\degree$   ?
*Hint: What letter do you see between the angles?

Find the unknown angle $d\degree$ .

 Find the unknown angle  $y\degree$  

 Find the unknown angle $s\degree$ .

 Find the unknown angle $k\degree$ .