Trigonometry Rules
We can all use log tables to look up these rules, but I am going to show you one method that will hopefully speed up your trigonometry.
Sin, Opposite, Hypotenuse, Tan, Adjacent, Cos.
There are several methods to remember this, when I was in school my maths teacher said it like this:
So, tow a car!
SOH (So) TOA (Tow A) CAH (Car)
My favourite one and it always sticks in my head is this one:
Some Old Hag Carries A Heavy Tin Of Apples
So now you can fiques it out easily
SOH = Sin of Opposite over Hypotenuse
CAH = Cosine of Adjacent over Hypotenuse
TOA = Tan of Opposite over Adjacent
Another Way:
S illy Old Harry Had A H andful Of Apples
Two Old Angels
Sitting On High
Chatting About Heaven
Oh hell another hour of algebra
Oh hell——–opposite ovr hypoteneuse
Another hour——–Adjacent ovr hypoteneuse
Of algebra———opposite ovr adjacent
We learned it as
“SOH-CAH-TOA”
((
sin = opp/hyp
cos = adj/hyp
tan = opp/hyp
))
Reminds me of a Native American name kind of… Chief Sohcahtoa.
“SOH = Sin of Opposite over Adjacent”
A little tweak is in order. SOH should be SIN = Opposite over Hypotenuse.
At least that’s what Chief Sohcahtoa told me.
Correction made, thanks for pointing it out Rich,
Kevin