Look at Part 1. Which set of side lengths form a triangle? How do you know?
5 cm, 7 cm, and 10 cm form a triangle. Answers vary; encourage students to reference the triangle inequality theorem.
Look at Part 2. What is the value of x? How do you know?
55
Can a triangle ever have more than 1 obtuse angle? How do you know?
No; Answers vary.
Look at Part 3. What type of angles are
Supplementary.
Now that you know the measurement of
What is
30º; Possible explanation:
What is
150º; Possible explanation:
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