Question

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

Answer 1

x = 60 degrees.

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.

Answer 2

x = 60°

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°