In the diagram of six adjacent angles shown above, which of the following must be true?

1. The sum of the six angles is $latex 360 \textdegree $
2. All six angles are congruent to each other.
3. Any pair of adjacent angles is supplementary

1. I, only (check answer)
2. II, only (check answer)
3. I and II, only (check answer)
4. I and III, only (check answer)
5. I, II, and III (check answer)

Have a solution? Hint? Question? Drop it below. We’d love to hear from you. A full solution will be posted on December 14th. If you would like to learn how to enter math formulas into this blog, visit the WordPress LaTeX tutorial page.