Copy the diagram at right on your paper. Then use the diagram to answer the questions below.

1. Name two pairs of angles that are supplementary.

   Hint (a):

   Supplementary angles add up to $180°$.

   Help (a):

   Look at angle $d$.
   What other angle can you add to that to make a sum of $180°$?
   What can you add to angle $c$ to get $180°$?

2. Name one pair of complementary angles.

   Hint (b):

   Complementary angles add up to $90°$.

   Help (b):

   Which angle can you add to angle $a$ to make a sum of $90°$?

3. Name two right angles.

   Help (c):

   One right angle is angle $e$.
   Which is the other right angle?

4. Name one obtuse angle.

   Help (d):

   Which is the only angle that is greater than $90°$?