Day 1:

Understand Points, Lines,

Line Segments, & Rays

AKS: 4MA.E.8 identify and draw geometric objects, classify polygons based on properties, and solve problems involving area and perimeter of rectangular figures.

Learning Target: I can explore and investigate points, lines, line segments, rays, angles. I can draw and identify points, lines, line segments, rays, angles.

Activating Strategy

Mini-Lesson

We have learned how to identify right, obtuse, and acute angles and how to measure angles using measuring tools, such as 360-degree protractors. We will use this knowledge in Unit 6 to help us compare, contrast, and classify two-dimensional figures.

Today, we are going to learn vocabulary terms that will help us use precise vocabulary when we are comparing, contrasting, and classifying two-dimensional figures.

Notice the following:

The goal of our lesson today is to learn the vocabulary we use to describe geometric shapes. We will use each of the images that Stacey drew to help us learn this vocabulary.

The first term we need to learn is the point. Look at Figure 1. A point is a location in space named by a letter.

Let’s look at Figure 3 next. It has two points: Point A and Point B.

We will also use Figure 3 to help us learn another vocabulary term.

Figure 3 is called a line. The arrows on the line in Figure 3 indicate that the line continues forever in both directions. We name a line by using two points on the line.

This line can be named two ways:

Let’s look at how to name the figure below.

This figure is called a line because it has two arrows that indicate that it continues forever in both directions. I can name the line by writing” line” and then the two points on the line by writing the two letters of the points on the line with a smaller line with arrows above the letters.

Name the line:

Let’s now look at Figure 2.

It shows an example of a line segment with two endpoints and a specific length.

Now, let’s see how to name a line segment. I can name the line segment by writing “Line Segment” followed by the two letters naming the endpoints on the line segment or by writing the two letters of the points on the line segment with a smaller line without arrows above the letters.

Show how to name the following line segments:

Here's another example of a line segment. See how we name it.

Guided Practice

Possible notices - Use dropdown for answers:

This figure has two points (Point L and Point K).
This figure has a line segment (named Segment LK).
This figure has an arrow indicating that it continues forever in one direction

Figure 4 is a Ray. A ray has one endpoint and extends forever in one direction. I can name the ray by writing “Ray”, then the letter of the endpoint and a point on the ray, or by writing the endpoint and the points on the line segment with a smaller ray above the letters.

Remember from Unit 5, when we learned about angles, that an angle is formed by two rays that meet a common endpoint?

Angle example:

This angle has two rays that meet at a common endpoint, which could also be called Point O.

Independent Task

1. FRECKLE - Complete THREE Freckle Assignments each week. DUE FRIDAY. Your HIGHEST score in Targeted Practice is your weekly math grade - Click HERE for Freckle website

GRADED Targeted Practice - Current skill (5 questions; Score Goal=80% or higher)
Fact Practice - Multiplication Fact Practice
Adaptive Practice - At YOUR level

2. iREADY Math - Complete 30 minutes at your level each week

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