Practise your skills
How to measure perimeter and circumference l Circumference l Discovering pi
Discovering pi
Part 1 – Take measurements
Take measurements of the diameter and circumference for the objects shown and
record your findings in the table below. The first one is done for you.
Use a flexible tape measure, or a piece of string, to measure circumference.
Your accuracy will be critical!
Object
Diameter (D)
7 cm
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Circumference (C)
23 cm
Object
Diameter (D)
Circumference (C)
Object
Diameter (D)
Circumference (C)
COMM1085
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Practise your skills
© WestOne Services 2010
How to measure perimeter and circumference l Circumference l Discovering pi
Object
Diameter (D)
Circumference (C)
Object
Diameter (D)
Circumference (C)
Object
Diameter (D)
Circumference (C)
COMM1085
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Practise your skills
How to measure perimeter and circumference l Circumference l Discovering pi
Discovering pi
Part 2 – Estimate pi
For each object, divide circumference by diameter and write your answer (rounded to
two decimal places) in the last column. The first one has been done for you.
Now find the average for all the measurements in the last column.
π(3.14). How close were you?
The result is your estimate of π
Object
Diameter (D)
7 cm
Circumference (C)
23 cm
Estimate of pi (π)
π
3.29 cm
Average =
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COMM1085
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