Lesson Planning of Angle and its Recognition
Subject Mathematics
Grade 4^{th}
Students` Learning Outcomes
 Recognize an angle through nonparallel lines.
 Draw and angle ∠AOB with vertex (O) and arrow OA and OB
 Recognize notation ∠AOB
Information for Teachers
 A line has no beginning point or end point. Imagine it continuing infinity to both directions. We can illustrate that by little arrows on both ends.
 A line segment has a beginning point and an end point or line segment has two end points.
 A ray has a beginning point but no end point or ray has one end point. Think of sun`s rays; they start at sun and go on forever.
 What is an angle? In mathematics, an angle is made up of two rays that have the same beginning arms point. That point is called the vertex and the two rays are called the sides (arms) of the angle.
 While writing an angle we put the vertex name always at the middle and the symbol of angle is written “∠”
 During this lesson, teacher should also consult textbook wherein and whenever it is required.
Material / Resources
Writing board, chalk/marker, duster, geometry box, two pencils, pebbles, textbook
Introduction
Worm up Activity 1

Worm up Activity 2

Development
Activity 1

Sum up / Conclusion
 Line, ray and line segment has two, one and no end point respectively.
 An angle is made up of two rays that have the same beginning arms point, that point is called the vertex.
 The angle between OA and OB is denoted by ∠AOB or ∠BOA.
Assessment
 Questions can be given to students in the form of worksheet or by writing on board
 How many vertexes are there in this figure?
 How many rays are there in this figure?
 What is the common point of the two rays?
 Which point is taken at the middle while writing the name of an angle?
 Name the angle.
Follow up
 Ask them to practice angles on board or floor through pebbles.
 Assign activities from the textbook.