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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

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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

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C= pi*d

13=pi*d

13/pi=d

r=d/2

r=13/(2pi)

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2 x 13 x pi = 81.68

Circumference of a circle = 2*pi*radius or pi*diameter

Circumference = 2*pi*13 = 81.68140899

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pi = 3.1415926535897

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2*pi*radius = circumference

2*pi*radius = 13

Making the radius the subject of the formula is:

radius = 13/(2*pi) = 2.06901426 feet

Check: 2*pi*2.06901426 = 13 feet

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