140 degrees, solve for the interior angle of LMK which can be found by 180-90-50 so now we know this is 40. However we need the other angle( KMU) that is supplemental with it, so 180-40 gives you 140 which is your final answer.
Answer: Fourth option: Triangle ZYB is congruent with triangle OWR, by SSS SSS: Side Side Side, because the three sides are given, and they are congruent
