Lesson Note for Primary 6
Lesson Note on Mathematics
Subject: Mathematics
Theme: Area
Topic: Area of a Circle
Sub Topic: Deriving the Formula for area of a circle
Date: dd/mm/yyyy
Class: Basic 6
Duration: 35 Minutes
No of Learners: 30
Learning Objectives:
By the end of the lesson learners should be able to:Say what a circle is
Derive the formula for the area of a circle
A plane curve everywhere equidistant from a given fixed point, the centre.
Rectangle with the sectors of a circle
But, Area of Rectangle = Length x Width
where Length = 1/2 circumference of the circle
= 1/2 x 2πr = πr
Width = radius
Area of the rectangle with the sector of a circle = πr x r
= πrᶺ2
Rationale:
The concept of the area of a circle is useful and applicable in daily reallife activities. The knowledge will assist pupils to understand its application in finding amongst others the base area of wells; pipes; fences; wheels of automobiles and cycles.
Prerequisite skills and knowledge:
 Measurement of lengths of the object including Area of rectangles.
 learners can draw as well as identify parts of a circle particularly the circumference radius, diameter and sectors
 concept of pi (π)
Teaching/ Learning Materials:
Manila cards/Pair of scissors/Glue/starch/Circular Cutout.
Reference Materials:
Online resources
Lesson Development:
STAGE 
TEACHER'S ACTIVITY 
LEARNER'S ACTIVITY 
LEARNING POINTS 

INTRODUCTION & GROUPING full class session (3mins) 
Review learners previous knowledge by asking them to find the area of a rectangle (e.g. length 6cm and width 4cm)  (In groups) solve the problem and present their results  Learner’s entry points. Area of rectangle = length × width 
STEP 1 5mins. Development 
provide learners with circular cutout  Students identify parts of the circle. 
Recognize circumference, diameter, radius and sectors 
STEP 2 7mins 
provide pupils in each group the materials mentioned above  (In groups) cut along the lines of the sectors of the circle to obtain 16 equal sectors 
Different strategies of obtaining sectors. 
STEP 3 8mins 
guide learners to divide one of the sectors into two equal parts and join this to the widths of both sides of the figure and stick the all cutouts with the glue on the manila cards as shown 


EVALUATION 5mins 
The teacher guide learners to solve the following problems. Calculate the area of a circle whose radius is

Area (A) of a circle = πrᶺ2

Asking the learners questions to assess the achievement of the set objectives. 
CONCLUSION 2mins 
What is the formula for the area of a circle  A = πrᶺ2  Improving their level of understanding of the Area of a circle. 
ASSIGNMENT 

Students solve other problems.  Improving their level of understanding of the Area of a circle. 