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Math Help - Relatively simple question but i just cant get it !

  1. #1
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    Relatively simple question but i just cant get it !

    Hi guys.

    Am stuck with a question which looks relatively easy.

    But i just simply cant get the answer !

    need help urgently as i need to submit this to my tutor by today else i am toast meat !!!


    Relatively simple question but i just cant get it !-clip_image002.jpg
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  2. #2
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    Quote Originally Posted by liukawa View Post
    Hi guys.

    Am stuck with a question which looks relatively easy.

    But i just simply cant get the answer !

    need help urgently as i need to submit this to my tutor by today else i am toast meat !!!


    Click image for larger version. 

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    The capital pi confused me a bit, thought it was a stray character typo, should be lowercase pi.

    Also don't make the same (reading) mistake I did and think pi*y is the volume of the sphere instead of the cylinder!

    Trick is to draw the radius of the sphere and find a right triangle, and use what you know about right triangles.
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  3. #3
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    Quote Originally Posted by undefined View Post
    The capital pi confused me a bit, thought it was a stray character typo, should be lowercase pi.

    Also don't make the same (reading) mistake I did and think pi*y is the volume of the sphere instead of the cylinder!

    Trick is to draw the radius of the sphere and find a right triangle, and use what you know about right triangles.
    Actually i have already worked backwards and i realise that r^2 = 25-1/4h^2.

    And i tried to form a right angle triangle with r and h/2 and by working backwards using pythogras theorem, i know that the hypontenus is 25. However, I just simply dont get it why is the hypontenus of this right angle triangle 25.
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  4. #4
    MHF Contributor undefined's Avatar
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    Quote Originally Posted by liukawa View Post
    Actually i have already worked backwards and i realise that r^2 = 25-1/4h^2.

    And i tried to form a right angle triangle with r and h/2 and by working backwards using pythogras theorem, i know that the hypontenus is 25. However, I just simply dont get it why is the hypontenus of this right angle triangle 25.
    The hypotenuse is 5. It's the radius of the sphere, given in the problem statement.
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  5. #5
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    Oh ya !

    Thanks dude !

    u are awesome !
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