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A circle's radius changes at 0.5 cm/s. How fast does its circumference change?
A0.5 cm/s
B2 pi cm/s
Cpi/2 cm/s
Dpi cm/s
Answer & Solution
Correct answer: D. pi cm/s
C = 2 pi r gives dC/dt = 2 pi times 0.5 = pi cm/s.
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