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In which Euclid proposition is the obtuse-angle form of the cosine law stated?
ABook I, Proposition 47
BBook II, Proposition 12
CBook II, Proposition 13
DBook III, Proposition 20
Answer & Solution
Correct answer: B. Book II, Proposition 12
Proposition II.12 treats obtuse-angled triangles and II.13 treats acute ones.
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