Question

If ln=54 and lm =31 then mn =?

Answer 1

This question is unsolvable,

because there is insufficient information (an angle)

If you have an angle you can use sine rule or cosine rule

sine rule: (sine(distance)) / angle = (sine(distance)) / angle

cosine rule: a² = b² + c² -2bc cos A

Answer 2

1,643 bc of multiplying or 85 bc of adding but I'm pretty sure it's multiplying