Introducing formation of angle

The standard angle concept based on the relative inclination of two lines meeting at a point irrespective of length of arms is discussed in an exploratory method.

Objectives

• Introduce children to the concept of angle
• To introduce measure of angles
• Methods of measuring angles

Estimated Time

30 minutes

Prerequisites/Instructions, prior preparations, if any

• Digital : Computer, geogebra application, projector.
• Non digital : Worksheet and pencil.
• Geogebra files : "Introduction to angle formation”

Download this geogebra file from this link.

Materials/ Resources needed

• Digital : Computer, geogebra application, projector.
• Non digital : Worksheet and pencil.
• Geogebra files : "Introduction to angle formation”

Process (How to do the activity)

Prior hands on activity (optional – children can use two pieces of thread to move around a fixed point or two sticks tied with a thread).

-Formation of angle

• Use the file to demonstrate formation of angle
• Ask how segments rotation changes angle
• Ask how many angles are formed

-Measure angles

• How do you measure this angle
• Measure both angles as the children say
• Ask if there is any difference in the angle measures
• Mention the convention of clockwise/anticlockwise measurement
• Mention reflex/exterior angle
• Is there a relation between the two angles measured

-Angle measure independent of segment length

• Does the angle depend on the segment length – drag the line segments to show.

Evaluation at the end of the activity

• What are the different types of angles?
• When two segments are joined at a point how many angles are formed?
• What is the measure of the total angle formed at a point is?
• What is the convention used to measure angles?