What is the formula for solving a triangle with the law of cosines if you have all the side lengths but need to find the angles?

Question

amistre64 · Answer

c^2 - a^2 - b^2
-------------- = cosC
     2ab

amistre64 · Answer

its the law of cosines solved for cosC

amistre64 · Answer

to get the angle youll need to take the consine inverse tho... and keep in mind that cos^-1 spits an angle out in the range of 0 to pi...so adjust as needed

amistre64 · Answer

hah... i see a typo

amistre64 · Answer

/-2ab...

            | c^2 - a^2 - b^2 |
cos^-1 |--------------- | = C  ; adjusted of course
            |       -2ab            |