gabbyalicorn
  • gabbyalicorn
A wheel has a diameter of 21 inches. Approximately how far does it travel in 3 revolutions? A. 63 in. B. 65.94 in. C. 98.91 in. D. 197.82 in.
Mathematics
chestercat
  • chestercat
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gabbyalicorn
  • gabbyalicorn
gabbyalicorn
  • gabbyalicorn
I think A
gabbyalicorn
  • gabbyalicorn
because 21 x 3 = g3

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gabbyalicorn
  • gabbyalicorn
63* i meant
anonymous
  • anonymous
i would think its A as well, but i would like to have it confirmed just to be sure.
gabbyalicorn
  • gabbyalicorn
yeah, okay.
gabbyalicorn
  • gabbyalicorn
anonymous
  • anonymous
A is not the answer
gabbyalicorn
  • gabbyalicorn
Why?
gabbyalicorn
  • gabbyalicorn
gabbyalicorn
  • gabbyalicorn
anonymous
  • anonymous
Keys: C=Circumference D=Diameter R=Radius 3.14=pi How to find the circumference: D=21 Divide that by 2 = 10.5 The formula for the circumference of a circle is 2×3.14×r Plug in the numbers: 2×3.14×10.5 Which equals 65.94 Then, we have to multiply that by 3. So, 65.94 x 3 = 197.82 Which is our answer.
gabbyalicorn
  • gabbyalicorn
unknownunknown
  • unknownunknown
So, remember c/d = pi. Re-arrange to get c = pi * d One circumference of a circle is equivalent to a full revolution. So we multiply by 3 for 3 revolutions. pi * d * 3 = 197.82, as YoungTrilogy stated.
gabbyalicorn
  • gabbyalicorn
okay, thank you :) √

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