SOHCAHTOA is a mnemonic that gives us an easy way to remember the three main trigonometric ratios They are sine (\sin), cosine (cos) and tangent (tan). SOH sin(θ)=
Opposite
Hypothenuse
CAH cos(θ)=
Adjacent
Hypothenuse
TOA tan(θ)=
Opposite
Adjacent
The longest side (side opposite/facing the right-angle) is the hypotenuse sin(θ)=
Opposite
Hypothenuse
Opposite side of 30∘ is 5 cm and hypothenuse side is PQ sin30∘=