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10 cards from this deck
Any triangle (not just right-angled)
Lowercase: a, b, c
Uppercase: A, B, C
Side a
asinA=bsinB=csinC\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}sinAa=sinBb=sinCc
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
Area = 12absinC\frac{1}{2}ab \sin C21absinC
2 angles & any side OR 2 sides & angle not between
2 sides & enclosed angle OR all 3 sides
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