How do I work out the value of angle X? And how do I explain it?

Answer:
x = 60°
Step-by-step explanation:
the triangle has 3 congruent sides and is therefore equilateral with 3 congruent angles, each of 60°
x and the angle on the right vertex are alternate angles and are congruent, so
x = 60°
Answer:
x = 60 degrees.
Step-by-step explanation:
This triangle is equilateral so each angle in it = 60 degrees,
The angle x is equal to the bottom right angle in the triangle ( as the top line is parallel to the line in the triangle and alternate angles are equal).
So angle x = 60 degrees.