PURPOSE: To show the relationship between the diameter and the circumference of a circle.
DESCRIPTION: A chain, originally wound around a cylinder, is unwound. The diameter of the cylinder can be compared with the length of the chain wound off one turn, so the value of pi may be approximated.
REFERENCES: (PIRA 1A50.10)
EQUIPMENT: Aluminum cylinder and chain on stand, assembled as photographed on request.
SETUP TIME: 5 minutes.
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