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What is the radius of the circle if the circumference of the circle is 13 pi cm?
Wiki User
∙ 14y ago
C = 2 pi r (divide by 2pi to both sides)
C/2pi = r (substitute 13 pi cm for C)
r = (13 pi cm)/(2 pi) = (13/2)(pi/pi) cm = 6.5 cm
Wiki User
∙ 14y ago
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