Geometry: Adjacent and Vertical Angles

Lesson Procedure:

Print the classroom lesson plan and worksheet questions (see below).

Lesson Excerpt:

Introduction
In our last lesson, we learned about congruent angles. Today we are going to learn about the relationships between pairs of angles. Before learning this new material, let’s review what we learned in our last lesson.
The word congruent refers to figures that are exactly the same. When we are talking about angles, we are saying that congruent angles have the same measure. Here is an example of two congruent angles.

These two angles are congruent. They have exactly the same measure. We can use a protractor to figure out the measure of each of these angles. Using a protractor is an excellent way to be sure that the two angles are congruent.

Adjacent Angles
Now that we have reviewed congruent angles, let’s talk about the relationship between pairs of angles. When we have a pair of angles together, there can be a relationship that defines the pair. Let’s begin by talking about adjacent angles.

Here is an example of a pair of adjacent angles.

Continued...