Unit 3, Lesson 18
Using Equations to Solve for Unknown Angles
Accelerated 7
Preparation
Lesson Narrative
In this lesson, students practice writing and solving equations of the form
The angles used in this lesson connect to earlier work with supplementary, complementary, and vertical angles, giving additional opportunities to build fluency with these concepts.
Teacher Notes for IM 6–8 Math Accelerated v.360
Use this optional lesson any time after Lesson 10 of this unit.
This lesson includes a set of practice problems, even though the last lesson in a unit typically does not. The problems are included here to give students more practice writing and solving equations to find unknown angles. If time is limited, consider focusing on practice problems 1–3.
- Determine whether a given equation represents the relationship between angles shown in a diagram.
- Solve an equation that represents a relationship between angle measures, and explain (in writing and using other representations) the reasoning.
- Write an equation of the form
or to represent the relationship between angles in a given diagram.
Required Preparation
None
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