## angle construction - video screen shot - Section 4: Construction

*angle construction - video screen shot*

# Line It Up!

Lesson 6 of 9

## Objective: SWBAT write equations of lines that are parallel and perpendicular given slopes and points. SWBAT construct parallel and perpendicular lines.

#### Do Now

*10 min*

Students will find the slope of a line given 2 points. This is a pre-requisite skill but may require review for students, particularly the slope formula.

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After reviewing parallel and perpendicular lines, we will review with students how to write equations in slope-intercept form and point-slope form. Then, you can focus on how to write parallel and perpendicular lines with given information like an equation and a point (MP #8).

The topic covered in this section are a review of CCSS in Algebra and you may find that students with weaker backgrounds need a more concrete review of this topic. The next lesson in this curriculum, Perp Lines are Perfect!, will continue to review writing equations.

*Students Notes - Line It Up!*

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#### Construction

*10 min*

Students will read through the steps to construct a parallel line through a given point, and can watch the video of this being constructed (MP 5). I like to watch the entire video first, read through the steps to construction, and then go through the construction step by step with the whole class. There is a second practice example provided for students to try on their own.

**Student Notes - Line It Up!**

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This is a packed lesson and there may not be time for students to complete the activity; in this case the class work can be assigned as homework.

For the exit ticket, students will write the equation of a line perpendicular to a given line and through a given point. This may be a good exit ticket to collect to see how and if students have strong algebra skills or if this topic needs further reinforcement.

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- UNIT 1: Introduction to Geometry: Points, Lines, Planes, and Angles
- UNIT 2: Line-sanity!
- UNIT 3: Transformers and Transformations
- UNIT 4: Tremendous Triangles
- UNIT 5: Three Triangle Topics
- UNIT 6: Pretty Polygons
- UNIT 7: MidTerm Materials
- UNIT 8: Circles
- UNIT 9: 3-D Shapes and Volume
- UNIT 10: Sweet Similar Shapes
- UNIT 11: Trig Trickery
- UNIT 12: Finally Finals

- LESSON 1: Proving It
- LESSON 2: Prove It with Angle Relationships
- LESSON 3: Skew Lines and their Friends
- LESSON 4: PTA (Parallel Lines, Transversals and Angles)
- LESSON 5: Flow Proofs and PTA
- LESSON 6: Line It Up!
- LESSON 7: Perp Lines are Perfect
- LESSON 8: Parabolas and Review of Line-sanity!
- LESSON 9: Assessment for Line-Sanity