This lesson plan teaches students about the area of a circle. It begins with an introductory puzzle about circles and their properties. Students then work in groups to cut out circular shapes and arrange them to form other shapes like parallelograms. This allows them to discover that the area of a circle can be calculated using the formula Area = πr^2. The lesson concludes by having students practice calculating the area of circles using different radii.

1. LESSON TEMPLATES
NAME OF THE TEACHER: SALEENA.S PERIOD :
NAME OF THE SCHOOL : TIME :
STANDARD : 9 DATE :
SUBJECT : MATHEMATICS STRENGTH :
UNIT : CIRCLES AVERAGE AGE :14+
TOPIC : AREA OF CIRCLE
CURRICULAR STATEMENTS
The students knows that the area of circle having radius ‘r’푖푠 휋푟2
Content Analysis
TERMS :Circle,Area
FACTS :
 Circle is the set of all points in a plane that are at a given distance from a given point ,the
centre
 The distance between any of the points and the centre is called the radius
 The extent or measurement of a surface is the area
 Area of circle having radius ‘r’ is ′ 휋푟2 ’
Learning Outcome
The students will be able to,
 recall the knowledge related to circles
 recognize different geometrical figures
 exemplify different situations for finding the relationship between sides and area of
circle
 compare the area of different dimensions of circle

2.  infer about the area of circle
 develop interest in finding the area of circle
 form appreciation about mathematical principles
Prerequisites
The students knows about,
1. circle
2. area of rectangle
3. mathematical calculations
Teaching Learning Resources
1. Models of circles
2. Charts
3. Ordinary classroom teaching aids

3. Classroom interaction procedure
response
introduction
Teacher presents a puzzle
“I am a geometrical shape.I have only one side.I have no angle . I
cover the maximum possible area for a given perimeter.Can you guess
who am i?
ACTIVITY-1
Teacher classifies students into four groups and gives the model of
circles and ask them to cut the circle into wedges
Then she ask the students to arrange them so that the point of the
wedges alternately up and down.
Teacher asks the students whether the arrangement looks like any
other shape you know?
Presentation:
Teacher gives another activity
Students arranges the wedges as per the directions of the
teacher.
Students suggests the shape is unfamiliar
Classroominteractionprocedure
response

4. ACTIVITY-2
Teacher ask the students to divide each wedge into four
thinner wedges so that there are sixteen wedges in total and arrange
the shape alternatively up and down and again ask the students if this
shape looks like a shape they know
Teacher says the students that when we cut the edges more thinner
and arrange like this the shape resembles a rectangle.
ACTIVITY-3
Teacher asks the students about the dimensions of the rectangle that
is formed.
Teacher asks the students to find out the area of rectangle that is
formed.
If we have the radius we can find out the area of circle using the
equation 퐴 = 휋푟2
Teacher gives the note and shows the chart.
AREA OF CIRCLE
Area (A) of Circle having radius ‘r’ is 퐴 = 휋푟2,where π=3.14
Application
Find the area of circle having radius 4cm?
What is to be found out?
What is the equation for finding the area of circle?
What is the value of ‘r’ given?
Find the area?
Students arranges the wedges
The students suggest that the shape look like
parallelogram
From the circumference of the circle students find out
that the length of the circle is equal to the half of the
circumference of the circle ie,πr and the height of the
rectangle is the radius ‘r’.
Students finds the area as 퐴 = 휋푟2
Area of circle
Area 퐴 = 휋푟2
r=4cm
A=π*4*4

5. =16π
=12.56
Review
1. What is a circle?
2. Give the equation for finding the area of circle?
3. What is the value of π?
Follow Up Activities
1) Find the area of the circle having diameter 18cm?
2) What is the radius of the circle having area 113.04cm