## Direct Instruction_Line Segments.docx - Section 2: Direct Instruction

# Line Segments

Lesson 2 of 14

## Objective: SWBAT create and interpret geometric notation and diagrams involving line segments and their measures; SWBAT measure line segments and construct line segments to specifications

#### Measurement and Construction

*20 min*

An overarching goal for this course is to impress upon students that, while Geometry is a very abstract subject, we have tools that allow us to make very concrete measurements involving geometric concepts. In this section of the lesson, students learn to use a ruler to measure segments. In my experience, it is a mistake to assume that students already know how to do this.

I start with an introduction to the markings on the ruler. I start with the metric side of the ruler since it is somewhat easier to understand for a novice. Next I model measuring lengths using a ruler. I do this on the document camera so that students can see clearly what I am doing.

Next I hand out the resource: Measuring and Creating Segments. As students work on the exercise, I circulate around the room playing the role of questioner/facilitator.

The types of questions I ask:

1. What do the directions say?

2. What information is given here?

3. Have you been as precise as possible in making your measurement?

4. How could you express in geometric notation that the length of the segment is.............cm?

#### Resources

*expand content*

- UNIT 1: Community Building, Norms, and Expectations
- UNIT 2: Geometry Foundations
- UNIT 3: Developing Logic and Proof
- UNIT 4: Defining Transformations
- UNIT 5: Quadrilaterals
- UNIT 6: Similarity
- UNIT 7: Right Triangles and Trigonometry
- UNIT 8: Circles
- UNIT 9: Analytic Geometry
- UNIT 10: Areas of Plane Figures
- UNIT 11: Measurement and Dimension
- UNIT 12: Unit Circle Trigonmetry
- UNIT 13: Extras

- LESSON 1: Origins of the Geometric Universe
- LESSON 2: Line Segments
- LESSON 3: Distances in the Coordinate Plane
- LESSON 4: Exploring Midpoint Quadrilaterals
- LESSON 5: Investigating Points, Segments, Rays, and Lines
- LESSON 6: Formative Assessment Day 1
- LESSON 7: Introducing Angles
- LESSON 8: Angle Measurements
- LESSON 9: Basic Constructions
- LESSON 10: Measuring to find Perimeter and Area
- LESSON 11: Finding Perimeter and Area in the Coordinate Plane
- LESSON 12: Geometry Foundations Summative Assessment Practice Day 1 of 2
- LESSON 13: Geometry Foundations Summative Assessment Practice Day 2 of 2
- LESSON 14: Introduction to Transformations