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Mathematics 8 Online
OpenStudy (anonymous):

the circumference of a circle varies directly as the diameter. A circular clock with a diameter of 1 foot has a circumference of 3.14 feet. What will the circumference of the clock be with a diameter of 2 feet?

OpenStudy (jdoe0001):

\(\begin{array}{llll} diameter&circumference\\ 1ft&3.14\\ 2ft&x \end{array}\bf \implies \cfrac{1}{2}=\cfrac{3.14}{x}\)

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