Since we are to find B and given only the lengths of the adjacent sides and the opposite angles, use Law of Cosines to answer the question above. This law is expressed as follows,
b² = a² + c² - 2ac x (cos B)
Substituting,
b² = 16² + 16² - 2(16)(16) x (cos 85°)
The value of b is approximately equal to 21.62 cm.
