anonymous
  • anonymous
i am working on high school geometry, i have to find the lateral and total surface areas of a cylinder with a base area of 169(pi) and a height that is 2 times the radius, i have been trying to solve the base area equation by setting it equal to 2(pi)raduis squared but i am stuck... help pleassseee?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
please help!
anonymous
  • anonymous
thank you
anonymous
  • anonymous
ok so the area of the base is 169pi

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anonymous
  • anonymous
so what do they mean by base area?
anonymous
  • anonymous
do they mean the area of the circle at the bottom?
anonymous
  • anonymous
yes
anonymous
  • anonymous
well the bottom of a cylinder is a circle
anonymous
  • anonymous
the area of a circle is pi*r^2
anonymous
  • anonymous
so pi*r^2 = 169pi
anonymous
  • anonymous
r^2 = 169pi/pi = 169
anonymous
  • anonymous
r = sqrt(169) = 13
anonymous
  • anonymous
if the height is 2*r, then the height is 2*13 = 26
anonymous
  • anonymous
you should be able to get the total surface area, volume, etc... from there
anonymous
  • anonymous
does that make sense?
Preetha
  • Preetha
Very smart, superduper
anonymous
  • anonymous
yes! thank you so much!
anonymous
  • anonymous
yay! thanks preetha

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