Answer:
<KMU is a 140 degree angle
Explanation:
Since the sum of all angles in a triangle are 180, we can add the 50 degrees and the 90 degrees and find the missing angle of KML
180 - (50+90) = KML
KML = 40
Since KML is 40, we subtract 40 from 180 to give us KMU
180 - 40 = KMU
KMU = 140
Good luck on your test :)