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# Circumference & Diameter

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## Christian Ruiz

on 3 September 2013

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#### Transcript of Circumference & Diameter

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Circumference & Diameter

Christian Ruiz - Amy Hardegen - Carmichael Real
Objective:
Measure the circumference and diameter of a circular object using yarn and a ruler.
Hypothesis:
We believe that you will be able to find the measurements,
but they will not be exact.
Theoretical Background:
Circumference= 2πr
Materials:
Procedure:
1.) Collect 5 circular objects that vary
in size
2.) To find the circumference:
With a piece of yarn, wrap it
around until you reach the
starting point of the yarn and
mark it
Measure it with the ruler
3.) To find the diameter
Place the object on a paper and trace the circular part
Find the middle and draw a straight line from one part of the circle to the other part
Measure the line with the ruler
Data
Diameter
Quarter: 3 cm
Chapstick: 1.7 cm
Lid: 5.4 cm
Bottle Cap: 2 cm
Water Bottle: 6.8 cm

Circumference
Quarter: 8 cm
Chap Stick: 5.5 cm
Lid: 16 cm
Bottle Cap: 9 cm
Water Bottle: 22.5 cm
Calculations
Conclusion:
it is possible to find the circumference using a piece of yarn and a ruler, but it is possible the measurements are not exact
the measurements are reasonable, but they are only an estimation
the basic physic concept used is measurement
difficulties were finding the measurements and being reasonable
errors that could have occurred are measuring wrong and being off

quarter
chap stick
lid
water bottle
cap
water bottle
Full transcript