Year 9 Trigonometry

SOH-CAH-TOA Drill

A focused trigonometry drill for choosing sides, selecting sine/cosine/tangent, and calculating side lengths. No inverse trig and no angle-finding.

The rule

First label the sides relative to the marked angle. Then choose the ratio from the pair of sides involved.

SOHsin = opp / hyp
CAHcos = adj / hyp
TOAtan = opp / adj

1. Side labels

40 triangle questions. Click the opposite, adjacent or hypotenuse side relative to theta.

2. Pick the ratio

40 questions. Read the two involved sides and choose sin, cos or tan.

3. Calculate side length

40 questions. Use the chosen ratio and angle to calculate the missing side.

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