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Math Help - Heeelllllppppp Mmmeeee!!!! :)

  1. #1
    Junior Member whytechocolate01's Avatar
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    Unhappy Heeelllllppppp Mmmeeee!!!! :)

    Given: Line AB is parallel to Line DC.
    What postulate or theorum justifies the statement..Triangle ABE is similar to Triangle CDE.

    Find the values of x and y. Please explain how to find x and y!!! Soo confused. Need help! Thanks!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by whytechocolate01 View Post
    Given: Line AB is parallel to Line DC.
    What postulate or theorum justifies the statement..Triangle ABE is similar to Triangle CDE.

    Find the values of x and y. Please explain how to find x and y!!! Soo confused. Need help! Thanks!
    was there a diagram that came with this question?
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  3. #3
    Junior Member whytechocolate01's Avatar
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    Post Diagram

    Soo sorry....Must have not gone thru...Here it is.
    Attached Thumbnails Attached Thumbnails Heeelllllppppp Mmmeeee!!!! :)-weird.jpg  
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  4. #4
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    Using the alternate interior and the vertical angle theorems, you can get three pairs of congruent angles. Thus by AAA you have two similar triangles.
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  5. #5
    Bar0n janvdl's Avatar
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    Plato, could you please explain in detail?
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    Quote Originally Posted by janvdl View Post
    Plato, could you please explain in detail?
    No, I will not do that. I do not believe in supplying fully worked out solutions. I think that we should help others learn mathematics and simply giving out a complete solution does not accomplish that objective. As you know there are others here will do that. So just wait they will come along and work it out.
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    Bar0n janvdl's Avatar
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    Bar0n janvdl's Avatar
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    Quote Originally Posted by whytechocolate01 View Post
    Given: Line AB is parallel to Line DC.
    What postulate or theorum justifies the statement..Triangle ABE is similar to Triangle CDE.

    Find the values of x and y. Please explain how to find x and y!!! Soo confused. Need help! Thanks!

    Ah wait i got it.

    A = C
    B = D
    E = E

    ABE ||| CDE

    Thus:
    6/14 = 7/y
    6y = 98
    y = 16,33

    And:
    6/14 = 9/x
    x = 21
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  9. #9
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    i like the idea of interior angles and verticle angles

    interior angles - and two parralel lines, their opposite, interior angles, along a transversal of the two parrel lines are equal

    verticle angles - whenever theres an X the two opposite angles are equal

    so AAA makes them similar
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by janvdl View Post
    Ah wait i got it.

    A = C
    B = D
    E = E

    ABE ||| CDE

    Thus:
    6/14 = 7/y
    6y = 98
    y = 16,33

    And:
    6/14 = 9/x
    x = 21
    why do you use commas for decimals?
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  11. #11
    Bar0n janvdl's Avatar
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    I think the Americans use dots and im not sure about the Brits and other Europeans, but South Africans use the comma to indicate a decimal.

    In SA a dot means multiply (2.3 = 6)
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  12. #12
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by janvdl View Post
    I think the Americans use dots and im not sure about the Brits and other Europeans, but South Africans use the comma to indicate a decimal.

    In SA a dot means multiply (2.3 = 6)
    ok, just wanted to know. because i have a TA that uses commas for decimals as well, so i was wondering if it's a regional thing. but i guess it avoids confusion, since dots and decimals get confused sometimes.

    why don't people use the x anymore to represent multiply when they get to higher mathematics? is there a problem with x?
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  13. #13
    Bar0n janvdl's Avatar
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    No we still use "x" too. But sometimes lots of x's can make a problem look very clumsy.
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