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"

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
 * {| class="wikitable"

Evaluation at the end of the activity
 * Sl No.
 * Segment 1 length
 * Segment 2 length
 * Interior angle
 * Reflex angle
 * Sum of 2 angles
 * Type of interior angle
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }
 * }