Question

What are the rule of sines and cosines? (the formulas?)

Answer 1

s= opp/hy
c= ad/hy

Answer 2

i know the rule of sine is
a/sin(A) = b/sin(B) = c/sin(C) but cosine? no clue..

Answer 3

There's no similar rule in use for cosine. There would be no point in that. There's the expanded Pythagorean theorum though.
\[a^2 = b^2 + c^2 - 2bc \cos \alpha\]

Answer 4

i learned it as the rule of cosine but thank you