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Math Help - Area of a quadrilateral

  1. #1
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    Area of a quadrilateral

    I need to know how to work out the area of a quadrilateral with to coordinates of A(-7,0) B(2,3) C(5,0) D(-1,-6).

    Would I be right in thinking I would do this:

    A and C lies on the x-axis.
    B and D are heights
    Split as two triangles and sum (ABC +ADC)
    =0.5*12*3+0.5*12*6=54

    Would this be correct if not where am I going wrong?

    Thanks.
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  2. #2
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    Re: Area of a quadrilateral

    what does the picture say?
    Attached Thumbnails Attached Thumbnails Area of a quadrilateral-quad.jpg  
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  3. #3
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    Re: Area of a quadrilateral

    What do you mean?
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  4. #4
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    Re: Area of a quadrilateral

    Quote Originally Posted by andyboy179 View Post
    What do you mean?
    checking your own work leads to proficiency and confidence when solving problems
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  5. #5
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    Re: Area of a quadrilateral

    So am I wrong?
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