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Math Help - what is the total surface area of the cone

  1. #1
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    what is the total surface area of the cone

    here is the link to the cone question can you answer it and show how.

    IMG_1368.jpg picture by BradCelt - Photobucket


    Mr F edit: This is a duplicate question also asked here: http://www.mathhelpforum.com/math-he...area-cone.html
    Last edited by mr fantastic; February 10th 2009 at 06:38 PM.
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  2. #2
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    Quote Originally Posted by gilzean View Post
    here is the link to the cone question can you answer it and show how.

    IMG_1368.jpg picture by BradCelt - Photobucket

    Hi gilzean,

    This is just a "plug and chug" formula problem. The formula for the Surface Area of a cone is:

    S.A.=\pi rs + \pi r^2, where

    r = radius of cone

    s = slant height of cone

    If you don't need the area of the base of the cone, then don't add the \pi r^2
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  3. #3
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    i dont understand , radius = 10cm slant height= 15cm

    total surface area = ????? ??? please???
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    Quote Originally Posted by gilzean View Post
    i dont understand , radius = 10cm slant height= 15cm

    total surface area = ????? ??? please???
    Substitute and solve.

    S.A.=\pi rs + \pi r^2, where

    r = radius of cone

    s = slant height of cone

    S.A=\pi (10)(15)+\pi(10^2)

    S.A.=150 \pi + 100 \pi

    S.A.=250 \pi

    S.A. \approx 785.4 cm^2
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  5. #5
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    says give your answer as a multiple of pie????
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  6. #6
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    Quote Originally Posted by gilzean View Post
    says give your answer as a multiple of pie????
    Then leave it as S.A.=250 \pi
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