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10 questions from this quiz
Drawing diagrams, identifying sides, choosing ratio
The longest side, opposite the right angle
tanθ=oppositeadjacent\tan \theta = \frac{\text{opposite}}{\text{adjacent}}tanθ=adjacentopposite
sinθ=oppositehypotenuse\sin \theta = \frac{\text{opposite}}{\text{hypotenuse}}sinθ=hypotenuseopposite
To find an unknown angle when two sides are known
Cosine = Adjacent/Hypotenuse
Evaluate the entire expression in one step
Tangent
θ=cos−1(adjacenthypotenuse)\theta = \cos^{-1}\left(\frac{\text{adjacent}}{\text{hypotenuse}}\right)θ=cos−1(hypotenuseadjacent)
Draw a clear, labelled diagram
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