# Circumference - GeoGebra by ewghwehws

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```									Circumference

Wilfredo Rodriguez
Multimedia Project #4

Circumference
What is a circle?
• A circle is defined as a set of points
equidistant from a given point.

Circumference
• The radius of a circle is a segment
that has an endpoint on the center
and another on an endpoint on the
circle.

Circumference
What is the diameter?
• A diameter is a straight line through the
center and terminating in both directions
on the circumference.

Circumference
What is the circumference?
• The circumference of a circle is the
distance around the circle. You can think
of it as the perimeter of a circle
(periphery).

Circumference
The circumference

of a circle

Circumference
How do we find the
circumference?
• For all circles of all sizes the formula
C  2r......, r,......  d
o        C

• C = circumference, d = diameter,

Circumference
First we need to find              (pi)!
What is      ?
Is it…..
3.14159265358979323846264338
327950288419716939937510582097
494459230781640628620899862803
482534211706798214808651328230
66470938446095505822172535…..?
Circumference
How do we find π?
• π is found through the ratio of the
circumference and the diameter. π is
always approximately 3.14.

C                   C
 3.14,...or......,  
d                    d
Circumference
The number of times you must travel along the
diameter of the circle to go the same distance as all
the way round the circle is known as Pi.

once
twice
three times across
and a little bit
more!
Since  is a bit more than 3.
Circumference
Summary

Circumference
=  × Diameter

Circumference
Student Activities
•   GeoGebra Demonstration
•   Student Activity 1
•   Student Activity 2
•   Student Activity 3
•   Student Activity 4
•   Archimedes

Circumference

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