anonymous
  • anonymous
If the radius of a circle is multiplied by 2, then how many times larger is the circumference of the new circle? 2. 4. 8. pi.
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
C = 2*pi*r , so if r is doubled the new C is 2*pi*2r , so it is 4pi.
anonymous
  • anonymous
well 2 times larger.
anonymous
  • anonymous
haha not quite, its just doubled. if r is double the circumference is doubled. so its just 2 times larger.

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anonymous
  • anonymous
I got it now, thanks! :)
anonymous
  • anonymous
If it asks for area, the equation is \[\pi*r^2 \] so when its doubled the area quadruples. (4x times larger)

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