Embedded Files
Learning Targets
- I can reason through multiple steps to find unknown angle measures.
- I can recognize when an equation represents a relationship between angle measures.
Notes
Notes
We can write equations that represent relationships between angles.
- The first pair of angles are supplementary, so x + 42 = 180.
- The second pair of angles are vertical angles, so y = 28.
- The third pair of angles are complementary, so z + 64 = 90.
Activities
Activities
4.1 True or False: Length Relationships
4.1 True or False: Length Relationships
Mathematicians refer to a length of a segment by naming its endpoints.
Check out segment AB!
Here are some line segments. Decide if each of these equations is true or false. Be prepared to explain your reasoning.
- CD + BC = BD
- AB + BD = CD + AD
- AC - AB = AB
- BD - CD = AC - AB
4.3 What’s the Match?
4.3 What’s the Match?
Match each figure to an equation that represents what is seen in the figure. For each match, explain how you know they are a match.
- g + h = 180
- g = h
- 2h + g = 90
- g + h + 48 = 180
- g + h + 35 = 180
Add to Your Notes
Add to Your Notes
If you know that angles a and b are vertical, what equation could you use to represent this angle relationship?
- a = b
If you know that angles c and d are complementary, what equation could you use to represent this angle relationship?
- c + d = 90
If you know that angles e and f are supplementary, what equation could you use to represent this angle relationship?
- e + f = 180
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