Welcome B Ed

B.Ed Matgerial New

1. WELCOME

2. Name of college : New B.Ed. College Nellimoodu
Name of student: SUMI S. V.
Option : Mathematics
Register Number: 180/13376012

3. Topic: Perimeter of a circle
Standard: IX
Subject: Mathematics

4. Perimeter of a circle

5. Circle
Circle is a closed figure. its
radius ‘r’ and the centre ‘c’.
c
r

6. Diameter
AB is the diameter of a circle. The
diameter is twice the radius.
c
A B

7. Determination of π
π is a constant obtained when
the perimeter of a circle is divided
by its diameter.
Value of πis approximately 3.14

8. How will you find the perimeter of a circle?
Perimeter of a circle is the length of the
circumference of the circle. In any Circle,
Perimeter of a circleπ
Diameter
Perimeter of a circleπ
2 x radius

9. Perimeter of a circle = 2πxr
= 2πr

10. PERIMETER OF A CIRCLE
Perimeter of a circle with radius ‘r’
in the product of πand twice the radius
ie, perimeter = 2πr
c r

11. Problem
1. If the Diameter of a circle is 4cm then
find the perimeter of the circle ?
Diameter = 4cm
Radius =4/2 = 2cm
Perimeter of a circle = 2πr
= 2πx 2
= 4πcm

12. Review Questions
1. What is perimeter?
2. What is the formula for the perimeter of a
circle?
3. If radius is 7cm then find the perimeter of
the circle?

13. THANK YOU