Geometry: Congruent Angles

Objectives:

• Students will review the basics of angles.

• Students will review classifying angles.

• Students will learn to identify congruent angles.

• Students will learn to use algebra to find the angle measures.

• Students will practice these skills in their independent work.

Suggested Grades:

Seventh Grade - Eighth Grade - Ninth Grade - Tenth Grade - including Special Education students

Lesson Procedure:

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

Lesson Excerpt:

Today, we are going to be working with congruent angles. Let’s review what the word congruent means.

Many times we talk about congruent when we are referring to plane figures. Are these two triangles or are these two parallelograms congruent? We can also refer to angles as being congruent or not congruent.

When two angles are congruent, they have exactly the same number of degrees. Two angles can be acute but not necessarily congruent. They are only congruent if they have the same number of degrees. Remember that we figure out how many degrees the angles have by using a protractor and by measuring the opening between the two rays of the angle. Let’s look at an example.

Continued...