# Trig. Ratios

#### Steve1992

Joined Apr 7, 2006
100
Is there an easy method on how to remember the trig. ratios on a right angled triangle...tan, cos, sin..?

I always find myself referring to my notes.

#### Papabravo

Joined Feb 24, 2006
21,310
From my class in conventional machining which I took at the local community college

SOH CAH TOA (pronounced SOO-KAA-TOW-AH). I forget the slightly filthy acronym that goes with it, but it decodes as:

SOH - Sine is Opposite over Hypoteneuse
CAH - Cosine is Adjacent over Hypoteneuse
TOA - Tangent is Opposite over Adjacent

#### electro eto

Joined Oct 5, 2006
4
well i always use OHSAHCOAT. the pronounciation alone could not be any easier.

OH=S i.e OPPOSITE/HYPOTHENUS =SINE

AH=C i.e ADJACENT/ HYPOTHENUS =COSINE

OA=T i,e OPPOSITE/ADJACENT = TANGENT

well thats the easiest way i learn it. work form me so hopefully it should work fro u too.

#### Steve1992

Joined Apr 7, 2006
100
Thanks all.
I'll give them a try.

Steve

#### Dave

Joined Nov 17, 2003
6,969
A favourite phrase of mine for remembering SOHCAHTOA was:

Smiles Of Happiness Come After Having Tankards Of Ale

You may also begin enjoying trigonometry!

Dave

#### Papabravo

Joined Feb 24, 2006
21,310
Sorry Dave, it may be mnemonic, but it fails the "slightly filthy" criteria.

ROFL

#### Dave

Joined Nov 17, 2003
6,969
Sorry Dave, it may be mnemonic, but it fails the "slightly filthy" criteria.

ROFL
Accepted, but it is very true.....and there is some educational value in it!

Dave