Sine, cosine and tangent

Label the sides from the angle's point of view.

Geometry and Trigonometry: Right-triangle trigonometry

sin θ = \frac{opp}{hyp}, cos θ = \frac{adj}{hyp}, tan θ = \frac{opp}{adj}

Work through it

$sin θ = \frac{3}{5}$ , $cos θ = \frac{4}{5}$ , $tan θ = \frac{3}{4}$

The opposite side is always the same side.

Opposite and adjacent depend on which angle you're using.

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