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Math Help - Find Area of Parallelogram

  1. #1
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    Find Area of Parallelogram

    Find the area of parallelogram given A(2,1), B(7,1), C(9,5) and D(4,5).

    MY WORK:

    1-I plotted each point on the xy-plane.

    2-I determined the base to be 5 and the height to be 8.

    3-I then used A = bh and found the area to be 40.

    However, the math book tells me that the area is 20.

    How can this be?
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  2. #2
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    Quote Originally Posted by sharkman View Post
    Find the area of parallelogram given A(2,1), B(7,1), C(9,5) and D(4,5).

    MY WORK:

    1-I plotted each point on the xy-plane.

    2-I determined the base to be 5 and the height to be 8.

    3-I then used A = bh and found the area to be 40.

    However, the math book tells me that the area is 20.

    How can this be?
    Looks like you measured the height wrong
    I get a height of 4
    with a base of 5
    gives an area of 20 as per the book
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  3. #3
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    I...

    Quote Originally Posted by bowline View Post
    Looks like you measured the height wrong
    I get a height of 4
    with a base of 5
    gives an area of 20 as per the book
    I should have used graphing paper. Ok....Thanks
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  4. #4
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    Quote Originally Posted by sharkman View Post
    I should have used graphing paper. Ok....Thanks

    Try GeoGebra

    You will probably save yourself a lot of paper in the long run
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  5. #5
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    ok...

    Quote Originally Posted by bowline View Post
    Try GeoGebra

    You will probably save yourself a lot of paper in the long run
    Thanks for the link provided.
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