Class: Primary 3
Term: 3rd Term
Week: 7
Age: 8 years
Duration: 45 minutes
Subject: Mathematics
Curriculum Theme: Geometry
Previous Lesson: Geometry, Straight Lines and Curves.
Topic: Geometry – Properties of Plane Shapes
Subject Matter: Shapes, Stating the relationship between the sides and angles of a: -Triangle, -Square and -Rectangle

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Identify and differentiate between a square, rectangle, and triangle.
State the properties of the sides of a triangle, square, and rectangle.
State the properties of the angles of a triangle, square, and rectangle.

Affective Domain:

Appreciate the importance of plane shapes in everyday life.

Psychomotor Domain:

Draw basic plane shapes such as a triangle, square, and rectangle.

Work cooperatively in groups to identify and describe properties of shapes.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Primary 3
State Unified Scheme of Work
New Concept Mathematics for Primary 3

Instructional Materials

The teacher will teach this lesson with the aid of:

Charts showing different plane shapes (square, rectangle, triangle)
Real-life objects with square, rectangular, and triangular faces (e.g., book, ruler, sandwich)
Whiteboard/chalkboard
Markers/chalk
Rulers

Rationale for the Lesson

This lesson helps pupils understand the basic properties of common plane shapes like triangles, squares, and rectangles. Knowing these properties enables them to identify shapes in their environment and forms a foundation for more advanced geometry.

Prerequisite/Previous Knowledge

Pupils can identify basic shapes like circles, squares, and triangles from their previous lessons.

Lesson Content/Board Summary

Geometry – Properties of Plane Shapes

What are Plane Shapes?

Plane shapes are flat, two-dimensional shapes that have only length and width, but no depth. They can be drawn on a flat surface like a piece of paper or a board.

Properties of a Square

A square is a plane shape with four straight sides and four corners. All sides of a square are equal in length, and all its angles are right angles (90 degrees).

The following are properties of a square:

It has 4 equal sides.
It has 4 equal angles.
All its angles are 90 degrees (right angles).
Its opposite sides are parallel.
(Teacher to draw a square on the board and label its sides and angles.)

Properties of a Rectangle

A rectangle is a plane shape with four straight sides and four corners. Its opposite sides are equal in length, and all its angles are right angles (90 degrees).

The following are properties of a rectangle:

It has 4 sides.
Its opposite sides are equal in length.
It has 4 equal angles.
All its angles are 90 degrees (right angles).
Its opposite sides are parallel.
(Teacher to draw a rectangle on the board and label its sides and angles.)

Properties of a Triangle

A triangle is a plane shape with three straight sides and three corners (vertices). The sum of the angles inside any triangle is always 180 degrees.

The following are properties of a triangle:

It has 3 sides.
It has 3 angles.
The sum of its angles is 180 degrees.
Its sides can be equal or different lengths.
(Teacher to draw different types of triangles on the board and label their sides and angles.)

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils, reviews the previous lesson on identifying basic shapes, and then introduces the new topic by showing real-life objects with different plane shapes like a book (rectangle), a square tile, and a triangular piece of cake.
Pupils’ Activity: Pupils respond to greetings, recall previous knowledge, and observe the objects shown by the teacher.
Learning Point: Pupils are prepared for the lesson and connect shapes to real-life objects.

Step 2: Identifying Plane Shapes

Time: 7 minutes
Teaching Skill: Observation/Identification
Teacher’s Activity: The teacher displays charts of a square, rectangle, and triangle, asking pupils to identify each shape and mention where they see such shapes in their environment.
Pupils’ Activity: Pupils identify the shapes on the charts and give examples of objects that have those shapes.
Learning Point: Pupils can correctly identify square, rectangle, and triangle.

Step 3: Properties of a Square

Time: 8 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher draws a square on the board, labels its sides and angles, and explains that all four sides are equal and all four angles are 90 degrees (right angles).
Pupils’ Activity: Pupils observe the drawing, listen to the explanation, and copy the properties into their notebooks.
Learning Point: Pupils understand and can state the properties of a square.

Step 4: Properties of a Rectangle

Time: 8 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher draws a rectangle on the board, labels its sides and angles, and explains that opposite sides are equal in length and all four angles are 90 degrees (right angles).
Pupils’ Activity: Pupils observe the drawing, listen to the explanation, and copy the properties into their notebooks.
Learning Point: Pupils understand and can state the properties of a rectangle.

Step 5: Properties of a Triangle

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher draws different types of triangles on the board, labels their sides and angles, and explains that a triangle has three sides and three angles, and the sum of its angles is 180 degrees.
Pupils’ Activity: Pupils observe the drawings, listen to the explanation, and copy the properties into their notebooks.
Learning Point: Pupils understand and can state the properties of a triangle.

Step 6: Class Activity

Time: 5 minutes
Teaching Skill: Practical Application
Teacher’s Activity: The teacher asks pupils to draw a square, a rectangle, and a triangle in their exercise books and label their sides and angles.
Pupils’ Activity: Pupils draw the shapes and label them as instructed.
Learning Point: Pupils practice drawing and labeling plane shapes.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

What is a plane shape?
Mention two properties of a square.
State one difference between a square and a rectangle.
How many sides does a triangle have?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, emphasizing the unique properties of squares, rectangles, and triangles. The teacher then gives homework: “List five real-life objects that are square, five that are rectangular, and five that are triangular.”
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: Pupils consolidate their learning and apply it to their environment.

Home Task: Solve three new exercises on Geometry – Properties of Plane Shapes. Show each step and check each answer.

Lesson Keywords

Shapes – The outline of an area or figure.
Plane – Flat surface.
Sides – The lines that form the boundary of a shape.
Angles – The space between two intersecting lines or surfaces at or close to the point where they meet.
Square – A plane shape with four equal straight sides and four right angles.
Rectangle – A plane shape with four straight sides and four right angles, especially one with unequal adjacent sides.
Triangle – A plane shape with three straight sides and three angles.
Geometry – The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs.

Differentiation

For pupils who are struggling, the teacher will provide pre-drawn outlines of shapes for them to trace and label. For advanced learners, the teacher will challenge them to identify more complex shapes in their surroundings or to explain why certain shapes are used for specific purposes (e.g., why bricks are rectangular).

Note for teachers using this lesson plan

Ensure that real-life examples are abundant to help pupils connect abstract concepts to concrete objects. Encourage active participation by asking open-ended questions and allowing pupils to share their observations. Emphasize the practical application of understanding shapes in daily life.