Question

How do I solve the missing verticals angles for L2 and L3?

Answer 1

The vertical angle theorem states that two opposite angles that are formed when two lines intersect each other are always equal, graphically this looks like this:

Then, if we apply this theorem to the figure shown we can say that

$\begin{gathered} L1=L3 \\ L2=L4 \end{gathered}$

This means that:

$\begin{gathered} L2=110.6 \\ L3=69.4 \end{gathered}$