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Math Help - my ans n given ans not same .. y?

  1. #1
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    my ans n given ans not same .. y?

    my ans for (a)i ---> 236cm cube.
    the given ans is ---> 240 cm cube ?
    hu is rite?!? and how to find length of AG?
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  2. #2
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    Quote Originally Posted by xiaoz
    my ans for (a)i ---> 236cm cube.
    the given ans is ---> 240 cm cube ?
    hu is rite?!? and how to find length of AG?
    Hello,

    you are dealing with a prism.

    V_{prism}=l\times w\times h

    The base area is 8 cm long and 5 cm wide, that means the area is 40 cm^2. The height of the prism is 6 cm. So

    V_{prism}=8 cm \times 5 cm \times 6 cm=240 cm^3

    The length of the diagonal through the space of the prism is calculated by:

    d=\sqrt{l^2+w^2+h^2}. Plug in the values you know:

    d=\sqrt{(8 cm)^2+(5 cm)^2+(6 cm)^2}=\sqrt{125 cm^2}=5\cdot \sqrt{5} cm \approx 11.18 cm

    Greetings

    EB
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  3. #3
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    wat about (b) show tt it shows..... (i)(a) n (b) .. how to show ?
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  4. #4
    Super Member malaygoel's Avatar
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    Quote Originally Posted by xiaoz
    wat about (b) show tt it shows..... (i)(a) n (b) .. how to show ?
    You can use the property that the length of tangents to a circle from an external point are equal.

    Keep Smiling

    Malay
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  5. #5
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    =.= how to get tangent length
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  6. #6
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    Quote Originally Posted by xiaoz
    =.= how to get tangent length
    Hi, xiaoz,

    the problem b) was done here: http://www.mathhelpforum.com/math-he...ber.php?u=1091

    Bye

    EB
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  7. #7
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    Quote Originally Posted by earboth
    Hi, xiaoz,
    the problem b) was done here: http://www.mathhelpforum.com/math-he...ber.php?u=1091
    Bye
    EB
    Hi,
    I noticed that the link I gave you doesn't work. No Idea why this happens now.
    Try this one please instead: http://www.mathhelpforum.com/math-he...ead.php?t=2494
    Bye
    EB
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