Did you miss the information that the student is 8 years old?
No, I wrote it for Dave -- who asked the question -- to read and understand, step by step, then translate to whatever form is appropriate and best for the 8 year old.
Thanks, but it's not like I couldn't solve it, I just had absolutely no idea what "linear pairs of angles" were, never heard the term before. Anyway, Sagan answered all but one of the questions.