Sine, Cosine and Tangent (Junior Cert Mathematics): Flashcards

Angles of triangle to lengths of its sides

$\sin(A) = \frac{\text{Opposite}}{\text{Hypotenuse}}$

$\cos(A) = \frac{\text{Adjacent}}{\text{Hypotenuse}}$

$\tan(A) = \frac{\text{Opposite}}{\text{Adjacent}}$

Side directly across from Angle A

Side next to Angle A (not hypotenuse)

Longest side, opposite the right angle

When opposite & hypotenuse are involved

When adjacent & hypotenuse are involved

When opposite & adjacent are involved

Sin=Opp/Hyp, Cos=Adj/Hyp, Tan=Opp/Adj

Finds angle when sides are known