Use the Law of Cosines
232 = 142 + 222 - 2(14)(22)cos A
529 = 196 + 484 - 616 cos A -159 = -616 cos A 0.93788198 = cos A 20.3 = A

Mark M.
tutor
529 = 196 + 484 - 616 cos A
Does that help?
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01/07/17
Rachel E.
01/07/17