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Area Formula #1
A=\frac12ab\sin\left(C\right)
Area Formula #2
A=\frac12ac\sin\left(B\right)
Area Formula #3
A=\frac12bc\sin\left(A\right)
Heron’s Formula
\sqrt{s\left(s-a\right)\left(s-b\right)\left(s-c\right)}
Law of Cosines Equation #1
b^2+c^2-2bc\cos\left(A\right)
Law of Cosines Equation #2
b^2=a^2+c^2-2ac\cos\left(B\right)
Law of Cosines Equation #3
c^2=a^2+b^2-2ab\cos\left(C\right)
Law of Sines
\frac{\sin\left(A\right)}{a}=\frac{\sin\left(B\right)}{b}=\frac{\sin\left(C\right)}{c}