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Sirlw

  • 4 years ago

how do you find the surface area of a cylinder? Ex: r=4 width(across)=21

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  1. Sirlw
    • 4 years ago
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    dont you have to do some king of net

  2. Sirlw
    • 4 years ago
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    *kind

  3. hoblos
    • 4 years ago
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    area = 2pi*r^2 + 2pi*r*h

  4. Sirlw
    • 4 years ago
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    i kno but

  5. Sirlw
    • 4 years ago
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    for the rectangle it gives u only one number

  6. Sirlw
    • 4 years ago
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    wait for the rectangle its pi*r=?*h=hight

  7. Sirlw
    • 4 years ago
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    whats r? radius?

  8. Sirlw
    • 4 years ago
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    but i thought for rectangle it was like height times width or the other side

  9. hoblos
    • 4 years ago
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    the area of the rectangle here = perimeter of the circle multiplied by the height since the perimeter actually its width

  10. Sirlw
    • 4 years ago
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    so the area of rectangle is the circumference of circle times the hieght?

  11. hoblos
    • 4 years ago
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    yup

  12. Sirlw
    • 4 years ago
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    in a book it said (pi d ) h

  13. Sirlw
    • 4 years ago
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    hmm ohmygod ur rite

  14. Sirlw
    • 4 years ago
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    THANKS YOU SO MOAUCH

  15. hoblos
    • 4 years ago
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    yeah you know that 2r=d

  16. Sirlw
    • 4 years ago
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    ye

  17. hoblos
    • 4 years ago
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    my pleasure XD

  18. Sirlw
    • 4 years ago
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    :)

  19. sfozturk61
    • 4 years ago
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    2(pi)rh+2(pi)r^2 is its surface

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