Hey there!
In this diagram, x is the exterior angle of the triangle.
The measurement of the exterior angle is the sum of the other two interior angles (this formula only works for triangles).
The two interior angles have measurements of 50 degrees and 93 degrees.
We can just add those together to get the value of x.

The measurement of x is 143 degrees.
Have an awesome day! :)
~collinjun0827, Junior Moderator