If on a triangle, side a=6, b=10 and c=7 what are the angle measurements.
Use the cosine rule:
cos(A) = (b2 + c2 - a2)/(2bc)
eg cos(A) = (102 + 72 - 62)/(2*10*7) → 0.8071
A = cos-1(0.8071) → 36.2º
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