Finding Missing Angles

Method

1. Label sides.
2. Choose sin, cos or tan.
3. Use inverse: sin^-1, cos^-1, tan^-1.

Example: Opp = 7 cm, Hyp = 10 cm
sin θ = 7/10 = 0.7
θ = sin^-1(0.7) = 44.4° (1 d.p.)

Example: Adj = 5 cm, Opp = 12 cm
tan θ = 12/5 = 2.4
θ = tan^-1(2.4) = 67.4°

Discussion

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