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Math Help - Trapezoid Formula

  1. #1
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    Trapezoid Formula

    Hello,

    OK, so I understand the basic formula to work out area of a Trapezoid

    A=(b+B)/2 *H

    I understand that b is the base width and B is the top width and H being height.

    I need to work out the area for a Trapezoid that has been rotated 90 degrees, with in a river cross section.

    So can I apply this formula to the height of either side of the section of river which would be b and B in the formula and H which now would be the width ?




    Thanks for any help in advance


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  2. #2
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    \displaystyle b and \displaystyle B are the parallel sides, and \displaystyle H is the perpendicular distance between them.
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