Figure abcd is similar to figure mnkl. enter a proportion that contains bc and kl.

a proportion that contains bc and kl is

It must be noted that if we speak of polygons being similar, it means that the ratio of the corresponding sides are proportional. Also, all the interior angles are congruent. Examples of proportion that would contain BC and KL are:
                                  BC / NK = CD / KL
or;
                                   AB / CD = MN / KL
There are still other proportions apart from what I presented above, would really appreciate if you establish them yourself.