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Math Help - Finding formula of an area question.

  1. #1
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    Finding formula of an area question.

    Pizzeria Buonapetito makes a triangular-shaped pizza with base width of 18 inches and height 12 inches as shown. Alice wants only a portion of the pizza, so she makes a vertical cut through the pizza and takes the shaded portion. Letting x be the bottom length of Alice's portion and y be the length of the cut as shown, answer the following questions.
    Here is a picture of the details above:
    Finding formula of an area question.-9eaea3709fefc44e756388d08d6846.gif
    Finding formula of an area question.-d79647531e4d3069fb348006f2af89.gif


    Here are the problems:
    Finding formula of an area question.-screen-shot-2012-10-11-3.41.39-pm.png

    I'm having a lot of trouble trying to find a formula for her area for the second interval.
    How would I approach these problems? Thank you!
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  2. #2
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    Re: Finding formula of an area question.

    for the second triangle (6 < x < 18) ...

    shaded area = area of large triangle - area of unshaded smaller triangle
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