All internal angles of a triangle will add up to 180 degrees. Since angle A and B are given to us as 87 and 32 degrees respectively, we can easily find angle C by adding A and B together and then subtracting from 180.
87 + 32 = 119 degrees
180 -119 = 61 degrees
Angle C = 61 degrees
Now we can easily find angle 1 when we know that angles on one side of a straight line will always add up to 180 degrees. Since angle C is 61 degrees then angle 1 is...
180 - 61 = 119 degrees
Answer D.
