Question

Given problem type SSS, how would you solve for any of the angle measures?



A. Use the triangle inequality theorem
B. Use the law of sines
C. Use the law of cosines
D. Use the Pythagorean Theorem

Answer 1

The law of cosines allows any one angle to be solved explicitly when all three side lengths are known.

cos(A) = (b^2+c^2-a^2)/(2bc)
and similarly for angles B & C.