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anonymous

  • 5 years ago

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?

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  1. anonymous
    • 5 years ago
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    please help!

  2. anonymous
    • 5 years ago
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    thank you

  3. anonymous
    • 5 years ago
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    ok so the area of the base is 169pi

  4. anonymous
    • 5 years ago
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    so what do they mean by base area?

  5. anonymous
    • 5 years ago
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    do they mean the area of the circle at the bottom?

  6. anonymous
    • 5 years ago
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    yes

  7. anonymous
    • 5 years ago
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    well the bottom of a cylinder is a circle

  8. anonymous
    • 5 years ago
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    the area of a circle is pi*r^2

  9. anonymous
    • 5 years ago
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    so pi*r^2 = 169pi

  10. anonymous
    • 5 years ago
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    r^2 = 169pi/pi = 169

  11. anonymous
    • 5 years ago
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    r = sqrt(169) = 13

  12. anonymous
    • 5 years ago
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    if the height is 2*r, then the height is 2*13 = 26

  13. anonymous
    • 5 years ago
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    you should be able to get the total surface area, volume, etc... from there

  14. anonymous
    • 5 years ago
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    does that make sense?

  15. Preetha
    • 5 years ago
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    Very smart, superduper

  16. anonymous
    • 5 years ago
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    yes! thank you so much!

  17. anonymous
    • 5 years ago
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    yay! thanks preetha

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