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If the circumference of a circle is 2 pi what is the radius
asked
Oct 8, 2018
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If the circumference of a circle is 2 pi what is the radius
Mathematics
middle-school
Shaheeda
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Shaheeda
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6
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c=2pir
r=radius
c=circumference
given
c=2pi
2pi=c=2pir
2pi=2pir
divide both sides by 2pi
1=r
radius is 1 unit
Shivam Singla
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Oct 9, 2018
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Shivam Singla
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C = 2 * pi * r
Plug in what we know:
2pi = 2 * pi * r
Divide 2 pi to both sides:
r = 1
(Remember, anything divided by itself is equal to 1)
A = pi * r^2
Plug in what we know:
A = pi * 1^2
A = pi * 1
A = 1 pi
So the area is '1 pi' or just 'pi'.
Hitesh Modha
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Oct 14, 2018
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Hitesh Modha
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