Types of angles

We will learn the following types of angles: right angles, acute angles, obtuse angles, straight angles, reflex angles and complete angle.

Objectives

Introduce children to different types of angles

Estimated Time

30 minutes

Prerequisites/Instructions, prior preparations, if any

Prior knowledge of point, lines, angles

Materials/ Resources needed

• Digital : Computer, geogebra application, projector.
• Non digital : Worksheet and pencil.
• Geogebra files : "Types of angles.ggb"

Download this geogebra file from this link.

Download this geogebra file from this link.

Process (How to do the activity)

• Prior hands on activity (optional – children can use two pieces of thread or sticks to move around a fixed point or two sticks tied with a thread).
• Vary the slider to show different angles formed
• What is observed with the change in position of the arm
• Mention the type of the angle depending on their measurements
• How does the change in arm length change the angle measure
• Vary the length of the arm to show that angle formed are independent of the arm length
• Record the values of arm lengths, values of angles and their types in the worksheet

Sl No.	Segment 1 length	Segment 2 length	Interior angle	Reflex angle	Sum of 2 angles	Type of interior angle