Stan's family members are choosing numbers to see in what order they will choose gifts. They roll a six-sided
number cube with sides labeled 1 through 6. All sides are
equally likely to be rolled.
What is the probability of rolling a number less than 3?

First you can solve for angle C because angles C and D are vertical and therefore congruent
So we do: 62+44+x=180 and solve
106+x=180
x=74
So then we know that angles C and D are 74 degrees 

Then we can solve for angle F:
x+74+50=180
Which can be rewritten as x=180-50-74

Hope this helps