Lesson Plan
Classifying Triangles by Internal Angles
Classifying figures by features is a fundamental geometry skill. Use this lesson plan to teach your students how to categorize triangles by internal angle types.
Grade:
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Learning Objectives
Students will be able to sort triangles based on features of their internal angles.
Introduction
(5 minutes)- Start off with a game of Simon Says. Direct your students to imitate you making three different angles with your arms: right angle (one at 90 degrees), an acute angle (one at less than 90 degrees), and an obtuse angle (one greater than 90 degrees).
- As you make your angle and the students imitate you, tell them the definition of each angle you make. For example, "Simon says make a right angle; this angles is at 90 degrees."
Beginning
- Provide visuals of each of the angles with their names for ELs to model.
- Allow them to repeat the definitions in their home language (L1) or their new language (L2).
- Define the terms actue angle, obtuse angle and right angle and create hand motions with students' input to represent these terms.
Intermediate
- Have students restate the definitions using some of the following math key terms: "obtuse," "acute," "right angle," "degrees," etc.