find the circumference of a circle that has a diameter of three inches. give exact value

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circumference=pi*diameter

C=(pi)(d)

=3.14159*3

=9.42477 in

this is not an exact value because pi is an irrational number, a non-ending, non-repeating decimal,

in other words, it cannot be written as a simple fraction a/b

Approximate value would be using 3.14 for pi

3.14

x 3

====

9.42 in.

C=3pi as an answer seems too easy for a homework problem. Secondly, the word *exact* may have different meanings for different people. Maybe to the student exact meant 3 times some approximate value of pi. Or maybe 3pi is what the student was looking for. Anyway, we gave him both answers to choose from.

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