In the triangle below, what is the length of MN

Answer:
A. 20
Step-by-step explanation:
The MNL triangle is isosceles, because it has two equal angles
MLN = 50 = MNL
Then, as it is an isosceles triangle, ML = MN. We already know that ML = 20, thus MN has to measure the same. We conclude MN = 20.