Hint for process of elimination: Go through each of the three statements individually and consider them for validity. Remember that the angles measure of a full circle is $latex 360\textdegree$. It also helps to know that supplementary angles two angles whose measures add to $latext 360\textdegree$.

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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)

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