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Math Help - Problems with cubes

  1. #1
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    i have an additional problems which i also have difficulty solving with

    3. Find the distance in inches between two vertices of a cube that are farthest from each other if an edge measures 10 inches

    4. If an edge of a cube is increased by 33%, by how much is the total surfaced area increased?
    Last edited by mr fantastic; October 11th 2009 at 01:55 AM. Reason: Moved from another thread.
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  2. #2
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    Quote Originally Posted by FailCalculus View Post
    i have an additional problems which i also have difficulty solving with

    3. Find the distance in inches between two vertices of a cube that are farthest from each other if an edge measures 10 inches

    \textcolor{red}{\sqrt{10^2 + 10^2 + 10^2}}

    4. If an edge of a cube is increased by 33%, by how much is the total surfaced area increased?

    \textcolor{red}{A = 6s^2}

    \textcolor{red}{A_{new} = 6\left(\frac{4}{3} s\right)^2}
    ...
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