Michessiah
Michessiah Michessiah
  • 22-07-2017
  • Mathematics
contestada

The circumference of a coin is 8π What is the radius? What is the diameter?

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legomyego180
legomyego180 legomyego180
  • 22-07-2017
Find the radius first.
Circumference of a circle:
[tex]=2 \pi r[/tex]
[tex]8 \pi =2 \pi r[/tex][tex] \frac{8 \pi }{2 \pi } = r[/tex]
r=4

diameter = radius x 2
4x2 = 8
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irspow
irspow irspow
  • 22-07-2017
The constant π is defined as C/d, meaning pi is the constant when the circumference of a circle is divided by the diameter of that circle.  Anyway:

πd=C  divide both sides by π

d=C/π, if C=8π then

d=8π/π

d=8

So the diameter is 8 units.
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