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Circumference of circle

by Chandran S

Cover

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MEASUREMENT
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Ellipse;
Ellipse;
Ellipse;
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circle
Ellipse;
CONTENT
Rounded Rectangle
1. Introduction

2. Circle

3. Circumference of Circle

4. Have a try!
LEARNING OBJECTIVES:
Rounded Rectangle
To understand the concepts of circumference of circle.
Real life example for circle in shape
Rounded Rectangle
circle shape traffic sign board
Rounded Rectangle
Bicycle wheel
Rounded Rectangle
clock
Circle:
Rounded Rectangle
* A circle is a round-shaped figure that has no corners or edges.

* In geometry, a circle can be defined as a closed, two-dimensional curved shape.
Ellipse;
Radius
Diameter
Ellipse;
Circumference of Circle
All circles are similar to one another. So, the ratio of the circumference to that of diameter is a constant, that is

Circumference
= constant [say p (pi)]
Diameter
Rounded Rectangle
Rounded Rectangle
the circumference of circle, C = 2 || r units.

|| = 3.14 (approximate)
r = Radius
___
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Rounded Rectangle
circumference
Ellipse;
EXAMPLE
Rounded Rectangle
Calculate the circumference of the bangle , diameter of bangle is 6 cm.
Rounded Rectangle
Solution

Given, d = 6 cm ,
Radius = d / 2
= 6 / 2
r = 3 cm

Circumference of a circle = 2 || r units
= 2 x 3.14 x 3
= 18.84
The circumference is 18.84 cm.
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