Answer:
Option A. x = 50°
Step-by-step explanation:
In the given triangle we will apply the condition that sum of all internal angles of a triangle is 180°
x + 55 + C = 180°--------(1)
Here angle C is the supplementary angle of 105°
Therefore C = 180 - 105 = 75°
Now we put the value of C in the equation 1
x + 55 + 75 = 180
x + 130 = 180
x = 180 - 130
x = 50°
Therefore option A. 50° is the correct option.
