Section 11.1 - Linear Measurement Examples And Worksheets With Answer Key Page 12
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19About π (pi):
The ancient Greeks discovered that if they divided the circumference of any
circle by the length of its diameter, they always came up with approximately
the same number (3.14).
Today, the ratio of circumference C to diameter d is symbolized as
π (pi).
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The approximate values of π (pi) are
, 3
, or 3.14
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Formulas for determining the circumference of a circle:
If radius is given, use C = 2πr
(circumference = 2 times pi times radius)
If diameter is given, use C = πd
(circumference = pi times distance)
EXAMPLES:
Problem:
Find the circumference of a circle if the radius is 2m.
Solution:
C = 2πr
= (2)(3.14)(2m)
= 12.56 m
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