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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Thread: Finding the correct angle

01252010, 07:57 PM #21Senior Member
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Oscar Has A Hat On Always
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01262010, 06:31 AM #22Junior Member
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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)Hypertherm Powermax 45 PLASMA'r, Lincoln SP100 MIGGER on gas, Lincoln 175 AC/DC Sq Wave TIGGER, Lincoln 225/125 AC/DC STICKER, 7" x 12" Horiz/Vert Band SAWER, Central 16"  16 speed Drill PRESSER, Sanborn 3HP 20Gal Air COMPRESSOR, Dayton 9" disk  6 x 48 Belt SANDER, Sears 8" Pedestal GRINDER, Victor O/A Torch BURNER, 150amp service to the 40'x64' Pole Barn  Priceless

01262010, 12:31 PM #23Senior Member
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Here's an old school one for the boys
Oscar Had Another Hard On Again
Sine Cosine Tangent
I forgot the one for girlsLast edited by FabTech; 01262010 at 12:34 PM.
Fab Tech

01262010, 03:57 PM #24Member
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The one we learned in school is just some Indian name or something
SOA CAH TOA something pronounced like "soo cah toe"

01272010, 02:03 AM #25
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.Equipped with red and blue... and red and green!
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01272010, 06:00 AM #26
We made a set one time but we made it with 16''x 16'' hardwood saw logs.
Just an idea

01312010, 05:59 PM #27
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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02012010, 06:37 PM #28Senior Member
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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.DYNASTY 200SD
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02032010, 01:51 PM #29Junior Member
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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
a=8*12=96
b=2*12+6=30
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