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14 cards from this deck
Cosine rule
Sine rule
Three
a2=b2+c2−2bccosAa^2 = b^2 + c^2 - 2bc \cos Aa2=b2+c2−2bccosA
cosA=b2+c2−a22bc\cos A = \frac{b^2 + c^2 - a^2}{2bc}cosA=2bcb2+c2−a2
sinAa=sinBb=sinCc\frac{\sin A}{a} = \frac{\sin B}{b} = \frac{\sin C}{c}asinA=bsinB=csinC
12absinC\frac{1}{2}ab \sin C21absinC
Clockwise from North
Not independent; third angle determined by first two
Ambiguous case - two possible solutions
Draw a diagram
Rounding too early causes significant errors
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