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Thread: Math question. (Though one)

  1. #1
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    Math question. (Though one)

    This is a question a teacher showed me.
    I, half on my class and some other teachers have been trying to solve it for about a week.
    I've drawn it in scale, so I know the answer is 80°, but IDK how to get to it. I've also solved it by analytic geometry, but I needed a scientific calculator to do so.

    Can somebody here help solving it the normal way?


    Find X:


    Thx.

  2. #2
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    Re: Math question. (Though one)

    That's totally not to scale...

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    Re: Math question. (Though one)

    It isn't to scale, as the two angles I have outlined below are 20 degrees. Thanks for posting this, though. I need to brush up on my geometry for my Calculus 3 class.
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  4. #4
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    Re: Math question. (Though one)

    I know it's not on scale, but all that is needed to solve are the angles.

    BTW, that angle you marked as 20° is actually 110°

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    Re: Math question. (Though one)

    Quote Originally Posted by smartboyathome View Post
    It isn't to scale, as the two angles I have outlined below are 20 degrees. Thanks for posting this, though. I need to brush up on my geometry for my Calculus 3 class.
    That isn't right either (or I can't decipher the pic). That would make the angle measure of a line 90 degrees, but it should be 180.

    EDIT: Some totally obvious first steps...
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    Last edited by cardinals_fan; March 28th, 2009 at 02:27 AM.

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    Re: Math question. (Though one)

    Quote Originally Posted by cardinals_fan View Post
    That isn't right either (or I can't decipher the pic). That would make the angle measure of a line 90 degrees, but it should be 180.
    Like I said, I need to brush up on my geometry. I can't even remember that, yet I'm in Calc 3.
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    Re: Math question. (Though one)

    I am sooo glad I never had to do stuff like this in school.
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    Re: Math question. (Though one)

    Quote Originally Posted by cardinals_fan View Post
    That isn't right either (or I can't decipher the pic). That would make the angle measure of a line 90 degrees, but it should be 180.

    EDIT: Some totally obvious first steps...
    Yeah, I got that far an I am now stuck.
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    Re: Math question. (Though one)

    Quote Originally Posted by Marlonsm View Post
    This is a question a teacher showed me.
    I, half on my class and some other teachers have been trying to solve it for about a week.
    I've drawn it in scale, so I know the answer is 80°, but IDK how to get to it. I've also solved it by analytic geometry, but I needed a scientific calculator to do so.

    Can somebody here help solving it the normal way?


    Find X:



    Thx.
    I for one would not like to find X, becuase i like tty terminals. I wish i could help you though, sadly I am only in 8th grade
    .i coi rodo

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    Re: Math question. (Though one)

    It's been a while since I've tackled anything quite like this (about 30 years), and I might need to sit down and think for a bit, but suspect that the two following nuggets will be of help:
    • The internal angles of a triangle add up to 180 degrees
    • The angles on a straight line also add up to 180 degrees
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