a b c B ----- = ----- = ----- /| sin(A) sin(B) sin(C) / | / | aVal cVal c/ |a ------ = ------ / | sin(A) 1 [sin(90)] / _| /____|_| aVal = sin(A) * cVal A b C sin(A) = aVal / cVal A = arcsin( aVal / cVal )