a^2 = b2 + c2 − 2bc cos(A)
b^2 = a2 + c2 − 2ac cos(B)
c^2 = a2 + b2 − 2ab cos(C)
| The law of cosines tells us how the sides of triangle relates to the cosine of its angle |
a^2 = b2 + c2 − 2bc cos(A) b^2 = a2 + c2 − 2ac cos(B) c^2 = a2 + b2 − 2ab cos(C) |
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