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  1. #21
    Join Date
    Dec 2005
    San Diego, CA

    Default Oscar Has A Hat On Always

    I believe this is Navy trick to remember the trig functions, I'll try to explain, hopefully without pictures.

    1. the trig functions apply to right triangles, (one 90 deg corner)
    2. the leg opposite the right angle is always the hypotenuse.
    3. from either the other 2 corners, the leg forming one side is adjacent
    4. the other is the opposite.

    with that in mind, take the first letter from the punch line to remember the trig function. sine = opp(Oscar)/hyp(Has), cos=adj(A)/hyp(Hat), tan=opp(On)/adj(Always)

    So if you can remember sin,cos,tan and the Oscar Has A Hat On Always, a $5 scientific calculator and a scrap of paper you're in business.

    For those more shop minded Hard is sometimes substituted with Hat
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  2. #22
    Join Date
    Dec 2009


    Or this might work - Oley Had (Sine) A Hairy (Cosine) Old Arm (Tangant)
    Seemed to stick from highschool.

    Another one on litmus paper - BRA (Blue to Red = Acid)
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  3. #23
    Join Date
    Jan 2008
    So. Cal


    Here's an old school one for the boys

    Oscar Had Another Hard On Again
    Sine Cosine Tangent

    I forgot the one for girls
    Fab Tech

  4. #24
    Join Date
    Jul 2009
    New York New York


    The one we learned in school is just some Indian name or something

    SOA CAH TOA something pronounced like "soo cah toe"

  5. #25
    Join Date
    Feb 2008


    Quote Originally Posted by XLMFAB View Post
    Thanks for all the replies. Im trying to save to got to welding school so I can eventually answer my own questions.
    I think you'll be disappointed if you go into a welding program expecting to master geometry and trigonometry.

    As for remembering mnemonics for solving certain triangles... forget about words. Just learn the simplest trigonometric figure. The unit circle.

    The radius is 1, so the hypotenuse is always 1. Makes things easy. Note that the point on the circle has an X coordinate equal to the cosine of the angle. It has a Y coordinate equal to the sine of the angle. And the slope of the hypotenuse is analogous to the tangent of the angle... which is rise over run (everybody knows slope is rise over run - even roofers). And rise over run happens to be Y/X.

    The more you learn about trigonometry and higher math, the more you realize this circle is the ultimate cheat sheet. It tells you the formulas to everything.

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  6. #26
    Join Date
    Feb 2009
    Island Falls Maine


    We made a set one time but we made it with 16''x 16'' hardwood saw logs.
    Just an idea

  7. #27
    Join Date
    Oct 2008


    from the ramps i see i hope your idea of a heavy truck is just a one ton? i think heavy truck I'm thinking 60,000 empty. it's great to see all the math but it needs to hold the weight. please post a pic if one ramp collapses. think about it.
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  8. #28
    Join Date
    May 2008


    Quote Originally Posted by Fred Smith View Post
    I believe this is Navy trick to remember the trig functions, I'll try to explain, hopefully without pictures.

    1. the trig functions apply to right triangles, (one 90 deg corner)
    Sort of... Law of Cosines and Law of Sines apply to solving remaining angles and lengths of non right triangles as well, but like Bodybagger said the unit circle is a giveaway for right angles. We always used the "Soak A toe A" SOH CAH TOA mnemonic.

    SOH = Sine = Opposite over Hypotenuse
    CAH = Cosine = Adjacent over Hypotenuse
    TOA = Tangent = Opposite over Adjacent

    It's really all about ratios just like the unit circle, but it's also about using what information you do have to solve for what you do not.

  9. #29
    Join Date
    Dec 2009

    Default No trigonometry needed

    If you subtract 4 feet from the top and the bottom, you get a right angled triangle where the base is 8 feet (a) and the height is 2 ' 6" (b). The side you want is the hypotenuse (c). So, if you use the Pythagorean Theorem:

    (a*a)+(b*b)=(c*c) or (a squared) + (b squared) = (c squared)

    Then you get:

    c = square root ((a*a)+(b*b)).

    In this case, convert the feet to inches

    c=square root ((96*96)+(30*30))
    =square root (9216+900)
    =square root (10116)
    =100.5783 inches
    =8.3815 feet = approximately 8 feet and 4 37/64 inches (almost 8' 4 9/16")

    Hope this makes sense

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