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Math Help - Confused help please. Thanks

  1. #1
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    Confused help please. Thanks

    Confused help please. Thanks-untitled.bmp

    In the figure above which of the following must be true?

    A. x + y = 180
    B. 90 + x = 180 - y
    C. 90 + x = y
    D. 2x = y
    E. 2y = x

    I'm confuse and came up with these for each choices and need help on choosing which one is right. Thanks

    A. x and y can't be 180 because the center has an 90 degree angle
    B. 90 + x should equal to less than 180 right?
    C. 90 + x is a large angle that should be bigger than y right?
    D. 2x will be bigger then y
    E. 2y will be bigger then x
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by aznmartinjai View Post
    Click image for larger version. 

Name:	untitled.bmp 
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    In the figure above which of the following must be true?

    A. x + y = 180
    B. 90 + x = 180 - y
    C. 90 + x = y
    D. 2x = y
    E. 2y = x

    I'm confuse and came up with these for each choices and need help on choosing which one is right. Thanks

    A. x and y can't be 180 because the center has an 90 degree angle
    B. 90 + x should equal to less than 180 right?
    C. 90 + x is a large angle that should be bigger than y right?
    D. 2x will be bigger then y
    E. 2y will be bigger then x
    the rule is, angles on a straight line add up to 180 degrees. so if you sum all the angles, you see, you get 180 degrees. the angles are x, y and 90

    so x + y + 90 = 180

    which choice reflects this?
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  3. #3
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    don't really know which one because theres no answer with x + y + 90 = 180..... can you tell me which one and help explain to me why it's that one thanks. That was where i got stuck which one is the answer because i already knew it's x + y + 90 = 180 but don't know which answer choice.
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by aznmartinjai View Post
    don't really know which one because theres no answer with x + y + 90 = 180..... can you tell me which one and help explain to me why it's that one thanks. That was where i got stuck which one is the answer because i already knew it's x + y + 90 = 180 but don't know which answer choice.
    Re-arrange B and see if it looks familiar.
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