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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?
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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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