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ps 2

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vaivish GMAT Destroyer! Default Avatar
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ps 2 Post Tue Aug 05, 2008 11:51 am
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  • Lap #[LAPCOUNT] ([LAPTIME])
    . The side surface of a cylinder is reeled with a rectangular plate. If the height of a cylinder tank is 12 feet and the perimeter of the circular base is 9 feet, what is the diagonal of the rectangular plate?
    (A) 13
    (B) 15
    (C) 18
    (D) 20
    (E) 21


    Oa is B

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    malolakrupa Rising GMAT Star Default Avatar
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    Post Tue Aug 05, 2008 7:36 pm
    Since the rectangular plate is reeled , the height becomes the length and the perimeter of the circular base becomes the breadth and using the famous theorem for right angle triangles ,

    diagonal^2 = length^2 + base^2 we get diagonal = 15 which is B.

    vaivish GMAT Destroyer! Default Avatar
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    Post Thu Aug 07, 2008 12:07 pm
    see 9 is perimeter so the diameter would be 9/pia. so how can we use 9^@ in the equation to get 15 as ans...

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    Stuart Kovinsky GMAT Instructor
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    Post Thu Aug 07, 2008 12:50 pm
    vaivish wrote:
    see 9 is perimeter so the diameter would be 9/pia. so how can we use 9^@ in the equation to get 15 as ans...
    The base of the rectangle IS the perimiter of the circle - there's no need to calcluate the circle's diameter.

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    vaivish GMAT Destroyer! Default Avatar
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    Post Sat Aug 09, 2008 7:49 am
    can you explain this one please. as i know perimeter is 2*pia* r. So how can it be the base of SQuare. if u draw the diagram it will be more clear to u. Thanks in advance

    raunekk GMAT Titan Default Avatar
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    Post Sat Aug 09, 2008 9:17 am
    u dont have to use 2 * pie * r...

    the circumference of the base of clyinder= the width of the rectangle

    height of the cylinder= length of the rectangle.

    the diagonal wll be given by d pythagoras theorem.

    andes1 Rising GMAT Star Default Avatar
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    Post Sat Aug 09, 2008 7:49 pm
    ????
    the circumference of the base of clyinder= the width of the rectangle ???
    reeled???

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    Post Sat Aug 09, 2008 8:34 pm
    andes1 wrote:
    ????
    the circumference of the base of clyinder= the width of the rectangle ???
    reeled???
    "Reeled" is a strange word that I wouldn't expect to see on the real GMAT, but it means "wrapped around".

    In other words, you form the rectangle by cutting a straight line down the side of the cylinder and laying out the cylinder flat along the ground. (Picture a piece of paper wrapped all the way around a can - if you were to lay the paper flat, it would be a rectangle.)

    So, the height of the cylinder becomes the height of the rectangle and the perimiter of the base of the cylinder ends up becoming the base of the rectangle.

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    andes1 Rising GMAT Star Default Avatar
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    Post Mon Aug 11, 2008 4:16 pm
    thanks a lot

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