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10 cards from this deck
12bcsinA\frac{1}{2}bc \sin A21bcsinA
Two sides & included angle; no perpendicular height given
asinA=bsinB=csinC\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}sinAa=sinBb=sinCc
Two angles & one side OR two sides & opposite angle
a2=b2+c2−2bccosAa^2 = b^2 + c^2 - 2bc \cos Aa2=b2+c2−2bccosA
Two sides & included angle OR all three sides
Area rule for area; cosine rule for third side/angle
sinC\sin CsinC gives both acute & obtuse solutions; check which fits
Draw diagram; identify triangles; apply trig rules step by step
...the largest angle
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