In any triangle the sim of two sides squared less twice those two side lengths multiplyed by the cosine of the included angle yields the included side squared.
a^2=b^2+c^2-2bc(cosA)
b^2=a^2+c^2-2ac(cosB)
c^2=a^2+b^2-2ab(cosC)
You would use these three to solve for a line segment and these other three would be used for finding an angle.
cosA=a^2-b^2-c^2/-2bc
cosB=a^2-b^2-c^2/-2ac
cosC=a^2-b^2-c^2/-2ab
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