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First always remember that SOH CAH TOA is used for __right triangles__. It is used to determine unknown angles or measure of sides.

O, H, A refer to the different sides of the triangle:

H -**hypotenus**, the side opposite the 90º angle, also the **longest** of the three sides

A -**adjacent**, this is always the one **beside** the reference angle (aside from 90º)

O -**opposite**, the angle opposite the reference angle

Note that O and A are interchangeable depending on where the reference angle is.

S, C, T: (this should've been taught to you before sohcahtoa)

S - sine (examples: sin0 = 0 , sin 90º = 1 , sin 30º = 1/2, sin 45º = / 2)

C- cosine (examples: cos0 =1 , cos 90º = 0 , cos 30º = /2, cos 45º = / 2

T - tangent (examples: tan 0 =0 , tan 90º = ∞ , tan 45º = 1)

Let x be the reference angle,

SOH: sin x =**o**pposite /**h**ypotenuse

CAH: cos x =**a**djacent /hypotenuse

TOA: tan x =**o**pposite /**a**djacent

O, H, A refer to the different sides of the triangle:

H -

A -

O -

Note that O and A are interchangeable depending on where the reference angle is.

S, C, T: (this should've been taught to you before sohcahtoa)

S - sine (examples: sin0 = 0 , sin 90º = 1 , sin 30º = 1/2, sin 45º = / 2)

C- cosine (examples: cos0 =1 , cos 90º = 0 , cos 30º = /2, cos 45º = / 2

T - tangent (examples: tan 0 =0 , tan 90º = ∞ , tan 45º = 1)

Let x be the reference angle,

SOH: sin x =

CAH: cos x =

TOA: tan x =