I can see that the image contains a set of geometry exercises, including questions about parallel lines, angles, and congruent/supplementary relationships. I'll walk through the first few questions:

Given:

• The diagram shows lines $a \parallel b$, and $c \parallel d$, with various angles labeled.

Questions:

1. If $a \parallel b$, name all angles that must be congruent to $\angle 1$:
   Since $a \parallel b$ and there is a transversal, the congruent angles to $\angle 1$ are:

   • $\angle 5$ (Corresponding angle)
   • $\angle 4$ (Alternate interior angle)
   • $\angle 8$ (Vertically opposite angle)

2. If $c \parallel d$, name all angles that must be congruent to $\angle 9$:
   Since $c \parallel d$ and there is a transversal:

   • $\angle 13$ (Corresponding angle)
   • $\angle 12$ (Alternate interior angle)
   • $\angle 16$ (Vertically opposite angle)

3. Name all angles congruent to $\angle 4$:
   $\angle 4$ is congruent to:

   • $\angle 8$ (Vertically opposite angle)
   • $\angle 1$ (Alternate interior angle)
   • $\angle 5$ (Corresponding angle)

4. Name all angles supplementary to $\angle 4$:
   Angles supplementary to $\angle 4$ (i.e., their sum is $180^\circ$) are:

   • $\angle 3$ (Adjacent on a straight line)
   • $\angle 2$ (Same-side interior angle with $\angle 4$)

The next few exercises (5 and 6) involve calculations based on the given angle measures:

5. If $m\angle 1 = 50^\circ$, then:

   • $m\angle 14 = ?$
     $m\angle 14$ is an alternate interior angle to $\angle 1$, so it is congruent:
     $m\angle 14 = 50^\circ$.

   • $m\angle 2 = ?$
     $\angle 2$ is supplementary to $\angle 1$, so:
     $m\angle 2 = 180^\circ - 50^\circ = 130^\circ$.

6. If $m\angle 9 = x$, then:

   • $m\angle 12 = ?$
     Since $\angle 12$ and $\angle 9$ are corresponding angles, they are congruent:
     $m\angle 12 = x$.

   • $m\angle 7 = ?$
     $\angle 7$ is vertically opposite $\angle 9$, so they are congruent:
     $m\angle 7 = x$.

Would you like more details on any of these solutions, or help with the remaining problems?

5 Related Questions:

1. What is the relationship between alternate interior angles when two lines are parallel?
2. How do corresponding angles behave when a transversal crosses two parallel lines?
3. What is the definition of supplementary angles, and how do you calculate them?
4. Can you explain how vertically opposite angles are formed and why they are congruent?
5. How do you identify same-side interior angles in a diagram with parallel lines and a transversal?

Tip:

When working with parallel lines and transversals, remember that there are several angle relationships (corresponding, alternate interior, alternate exterior, and same-side interior) that can help you quickly find angle measures!