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    JeanLeon's Avatar
    JeanLeon Posts: 4, Reputation: 1
    New Member
     
    #1

    Aug 2, 2009, 01:38 PM
    Area of a Surface
    Attached is a picture of the shape I would like the formula for to calculate the area. Can someone help please?
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    503person's Avatar
    503person Posts: 57, Reputation: 11
    Junior Member
     
    #2

    Aug 2, 2009, 01:42 PM

    You need to draw a straight line down from th end of D down to be so that you have a rectangle and a triangle. Then find the area of the rectangle (lxw) then find the area of the triangle

    Here's the formulas

    Area of a Triangle
    JeanLeon's Avatar
    JeanLeon Posts: 4, Reputation: 1
    New Member
     
    #3

    Aug 2, 2009, 01:57 PM
    Quote Originally Posted by 503person View Post
    You need to draw a straight line down from th end of D down to be so that you have a rectangle and a triangle. Then find the area of the rectangle (lxw) then find the area of the triangle

    Here's the formulas

    Area of a Triangle
    Thanks a lot for your help!
    s_cianci's Avatar
    s_cianci Posts: 5,472, Reputation: 760
    Uber Member
     
    #4

    Aug 2, 2009, 02:02 PM
    This appears to be a trapezoid. As such, you can apply 503's method or apply the formula for the area of a trapezoid: A = (1/2)(b1 + b2)
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
     
    #5

    Aug 2, 2009, 02:03 PM
    That is a trapezoid. The area of which is
    503person's Avatar
    503person Posts: 57, Reputation: 11
    Junior Member
     
    #6

    Aug 2, 2009, 02:18 PM

    I always take the long way around... it helps me to break down problems into smaller easier ones then add the solutions. But galactus' solution is probably easier :)
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #7

    Aug 2, 2009, 02:45 PM

    503, I did it like you did. I haven't had this stuff for a gazillion years and that was just what logically worked for me. Sometimes the "longer" way can be the easier way if that's what you understand. Since I have to understand everything and not just plug n chug, I'll have this way solved before I ever figure out why galactus' formula even works. :-) (Hey, I'm happy I even figured it out, longer way or not.)
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #8

    Aug 7, 2009, 04:27 AM

    Well, the general formula for the area of a trapezium is:


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