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anonymous

  • one year ago

I have another question (then another one) but I am really just trying to understand this. So there are two horizontal pararell lines intersected by a transversal.

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  1. anonymous
    • one year ago
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    I'll draw it really quickly

  2. anonymous
    • one year ago
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    |dw:1443726570597:dw|

  3. anonymous
    • one year ago
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    I think it has something to do with interior angles but I get lost after that

  4. freckles
    • one year ago
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    |dw:1443726687361:dw|

  5. freckles
    • one year ago
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    where a+b=180

  6. freckles
    • one year ago
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    |dw:1443726817641:dw|

  7. freckles
    • one year ago
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    so we know 2x+1=85

  8. freckles
    • one year ago
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    and 85+(3y+5)=180 since a+b=180

  9. anonymous
    • one year ago
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    we know that 2x+1=85 because it is congruent to the one that says 85, right?

  10. freckles
    • one year ago
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    the angle that has measure 2x+1 and the angle that has measure 85 are called alternate interior angles

  11. freckles
    • one year ago
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    so the angle that has measure 2x+1 and the angle that has measure 85 are congruent therefore 2x+1=85

  12. anonymous
    • one year ago
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    Ohhh okay, now I can get y, which would be 85+(3y+5)=180

  13. anonymous
    • one year ago
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    But what about x?

  14. freckles
    • one year ago
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    what do you mean about x?

  15. freckles
    • one year ago
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    you have to both equations

  16. freckles
    • one year ago
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    2x+1=85 and 85+(3y+5)=180

  17. anonymous
    • one year ago
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    Ohhh okay sorry I totally missed that. Thank you very much I understand it better now

  18. freckles
    • one year ago
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    np

  19. freckles
    • one year ago
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    http://www.mathwarehouse.com/geometry/angle/parallel-lines-cut-transversal.php here is site that you might like though in that first example where they talk about can you identify each type of congurent angle... I think the third column should read corresponding angles

  20. freckles
    • one year ago
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    It also mentioned something about a Z test never heard of that before now but you may find that test helpful it is for testing what angles are congruent

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