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Write the formula for finding the circumference S of a circle. Make r the subject in this formula and find r when S=154cm.

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Write the formula for finding the circumference S of a circle. Make r the subject in this formula and find r when S=154cm.
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The formula for finding the circumference S of a circle of radius r is `S=2pir`. Hence, `r=(S)/(2pi)`. Substituting S=154 cm and `pi=(22)/(7)` in above equation, we get `r=24.5cm`
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