# Plane Figures – Square, Rectangle and Triangles

Last Updated on May 9, 2020 by Alabi M. S.

MATHEMATICS

THEME: Mensuration and Geometry

TOPIC: Plane Figures

PERFORMANCE OBJECTIVES

By the end of the lesson, the pupils should have attained the following objectives (cognitive, affective and psychomotor):

• identify the basic properties of plane figures such as types of triangles, a rectangle and a square.

ENTRY BEHAVIOR

The pupils are required to already have taught and learned types of triangles and quadrilateral.

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of rectangular and square shapes, metre rule/tape and protractors.

METHOD OF TEACHING

MAIN REFERENCE MATERIALS

1. Prime Mathematics book 6;
2. New Method Mathematics book 6

CONTENT OF THE LESSON

LESSON 1

PERIOD:

DATE:

TIME:

INTRODUCTION PLANE FIGURES

Plane figures are flat two-dimensional (2D) shape. A Plane figure can be made of straight lines, curved Lines, or both straight and curved lines. The shapes are closed.

EXAMPLES OF A PLANE FIGURES

These are triangles, quadrilaterals, pentagon, hexagon, octagon, nonagon, decagon, etc.

BASIC PROPERTIES OF PLANE FIGURES

QUADRILATERALS

These are figures with four sides, e.g. square, rectangle, rhombus, parallelogram, trapezium and kite. LESSON 2

PERIOD:

DATE:

TIME:

TRIANGLES

TThere are four types of Triangles:  Note: The angles in a triangle add up to 180°

Further exercise will be taken from the listed reference materials.

PRESENTATION

To deliver the lesson, the teacher adopts the following steps:

1. To introduce the lesson, the teacher revises the previous lesson- time. Based on this, he/she asks the pupils some questions;

2. Guides pupils to identify properties of plane figures such as types of triangles, squares and rectangular shapes.

3. Guides pupils to identify properties such as equal sides, parallel sides, right angles, line of symmetry, diagonals of square and rectangle.

4. Pupil’s Activities – Identify properties of plane figures such as square and rectangular shapes.

CONCLUSION

To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson….

EVALUATION

Pupils to state the properties of types of triangles, a square and a rectangle.

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