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Math Help - maths for surveying purposes

  1. #1
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    maths for surveying purposes

    Hi there,

    i have attached a PDF showing a shape, of which i have to calculate area.
    i dont know where to start from.it would be much appreciated if anyone can help me out.

    thanks
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by masiboy View Post
    Hi there,

    i have attached a PDF showing a shape, of which i have to calculate area.
    i dont know where to start from.it would be much appreciated if anyone can help me out.

    thanks
    ABEF is a rectangle of known dimensions, so you can calculate its area

    CDEG is a rectangle of sideds: 18.3 and 19.9-9.8 metres

    GBC is a sector of a circle so its area is \pi r^2 (\theta/360) , where r=19.9-9.8, and \theta is 82^{\circ}13'46'' expressed in decimal degrees.

    CB
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  3. #3
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    thanks Captain Black,now it loks quite straight forward to me, so this means height of 32.4 doesnt play any part in calculating the area???
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  4. #4
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    Quote Originally Posted by masiboy View Post
    ...
    i have attached a PDF showing a shape, of which i have to calculate area.
    ...

    Given:
    BE and CD are parallel
    &
    FD and GC are parallel

    That implies that point G CANNOT be on the line BE.
    If G were on the line BE then angle BGC (which is given as 82deg13min46sec) should equal angle GCD (which is indicated as 90degrees).

    It really looks as if this is a "flawed" question.
    That is, you are given invalid information for the purpose of understanding how you handle errors.
    What data will you use and what information will you ignore?
    Last edited by aidan; July 23rd 2009 at 02:03 PM. Reason: typo
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  5. #5
    Grand Panjandrum
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    Quote Originally Posted by CaptainBlack View Post
    ABEF is a rectangle of known dimensions, so you can calculate its area

    CDEG is a rectangle of sideds: 18.3 and 19.9-9.8 metres

    GBC is a sector of a circle so its area is \pi r^2 (\theta/360) , where r=19.9-9.8, and \theta is 82^{\circ}13'46'' expressed in decimal degrees.

    CB

    Except what I thought were rectangles are in fact not rectangles!

    CB
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