Math

Given ray OC is perpendicular to ray OA and <DOA=135 degrees,what would be the measure of <DOC given that <COB=3x-7 and <BOA= -2x+4.

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  1. Anna/Susie -- please use the same name for your posts.

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    👩‍🏫
    Ms. Sue
  2. I'm getting x=138.Is that true?

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  3. not likely. How did you figure it?

    If x=138, -2x+4 = -272

    not likely one of the angles

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  4. Then I don't know how to do it.Can you please show me?I don't get it.

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  5. It seems that point B is irrelevant.
    <AOC = 90
    <AOD = 135
    So, <COD = 45

    As for finding x, it seems that
    <COB + <BOA = 90
    3x-7 + (-2x+4) = 90
    x-3 = 90
    x = 93
    But that makes no sense, since then <BOA is negative.

    If you lay out the diagram, with point A at the left, do points A,B,C,D progress left-to right?

    If not, then describe the diagram more fully. Which are adjacent angles?

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