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Math Help - trig hmwk

  1. #1
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    trig hmwk

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    Last edited by Revelsyn; October 13th 2008 at 08:20 AM.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Revelsyn View Post
    here's a question that i was so sure i was doing right but everytime the answer comes out as 'error' ><



    "find the measure of angle θ"




    here's what i did: sin52.3 = 11.7/x
    sinθ = 14.79/14.6
    then i get error
    The book says the answer is: 52.7 degrees
    For starters, I'm getting x = 13.9, not 14.79. The reason you are getting an error is that your sin(theta) as you have written it, is greater than 1. Where exactly you are going wrong I can't say.

    -Dan
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    Quote Originally Posted by Revelsyn View Post
    here's a question that i was so sure i was doing right but everytime the answer comes out as 'error' ><



    "find the measure of angle θ"




    here's what i did: sin52.3 = 11.7/x Mr F says: Correct.
    sinθ = 14.79/14.6 Mr F says: Logically correct. See my main reply.

    then i get error Mr F says: For exactly the reason that topsquark stated - "your sin(theta) ..... is greater than 1." But this is NOT your fault. See my main reply.

    The book says the answer is: 52.7 degrees Mr F says: Book, schmook. The book is wrong.
    The data the book has supplied in its diagram is geometrically impossible. In a right-triangle, you can't have a hypotenuse (14.6 m) shorter than one of the other sides (14.79 m). I say.

    It's geometrically impossible for the angle at E to be a right angle if DG = 14.6 and triangle EFG is as given ..... Alternatively, DG = 14.6 is geometrically impossible if the angle at E is a right angle and triangle EFG is as given ......

    One of the following is clearly wrong (perhaps a misprint): 11.7 m, 14.6 m, 52.3 degrees.


    PS: topsquark, x = 14.79 is correct ...... I'd almost guess that you were in radian mode by mistake except you'd get 13.08, not 13.9 ...... Maybe radian mode and bad light ......
    Last edited by mr fantastic; January 30th 2008 at 09:27 PM.
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    Forum Admin topsquark's Avatar
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    Quote Originally Posted by mr fantastic View Post

    PS: topsquark, x = 14.79 is correct ...... I'd almost guess that you were in radian mode by mistake except you'd get 13.08, not 13.9 ...... Maybe radian mode and bad light ......
    (grumbles) That's two tonight. I really am going to bed now.

    -Dan
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    Quote Originally Posted by topsquark View Post
    (grumbles) That's two tonight. I really am going to bed now.

    -Dan
    Either that or turn the light up.
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