Angles in Mathematics

Angles in Mathematics

Learning Objective

At the end of the lesson, you will be able to identify and name different types of angles in English.

Make sure to emphasize the importance of being able to name angles in English for future math lessons and real-world applications.

What do you already know about angles in mathematics?

What is an angle?

An angle is formed by two rays that share a common endpoint called a vertex.

Use visual aids and ask students to identify the vertex, rays, and angle in different examples.

Types of Angles

There are four main types of angles: acute, right, obtuse, and straight.

Provide examples of each type of angle and ask students to identify and name them.

Acute Angles

Acute angles measure less than 90 degrees and look like a 'sharp' angle.

Ask students to give examples of acute angles and measure them using protractors.

Right Angles

Right angles measure exactly 90 degrees and look like the corner of a square.

Provide examples of objects with right angles and ask students to identify and draw them.

Obtuse Angles

Obtuse angles measure between 90 and 180 degrees and look like a 'blunt' angle.

Ask students to give examples of obtuse angles and measure them using protractors.

Straight Angles

Straight angles measure exactly 180 degrees and look like a straight line.

Provide examples of objects with straight angles and ask students to identify and draw them.

Practice

Use the following image to identify and name the different types of angles.

Provide an image with different types of angles and ask students to identify and name them in English.

Write down 3 things you learned in this lesson.

Have students enter three things they learned in this lesson. With this they can indicate their own learning efficiency of this lesson.

Write down 2 things you want to know more about.

Here, students enter two things they would like to know more about. This not only increases involvement, but also gives them more ownership.

Ask 1 question about something you haven't quite understood yet.

The students indicate here (in question form) with which part of the material they still have difficulty. For the teacher, this not only provides insight into the extent to which the students understand/master the material, but also a good starting point for the next lesson.