Thursday, February 12, 2009

Euclid's Elements Book II, Proposition 13: Law of Cosines

Acute Triangle
 Euclid's Elements Book II, Proposition 13: Law of Cosines.

See complete illustration at:
gogeometry.com/geometry/euclid_elements_book_ii_proposition_13_cosines_law.htm

Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

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