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volume of right circular cones total surface area is 550dm3. its radius of base is 5dm. find its total surface area

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asked by ton
  1. the base has area 25π dm^2
    so, the height can be found using
    πr^2h = 550
    25πh = 550
    h = 7
    So, the slant height is s = √(2.5^2+7^2) = 7.43
    That makes the lateral area 2πrs = 233.5
    Now just add the base to the lateral area...

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    posted by oobleck

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