How do I work out angle X?

Thanks

triangles are always 180 degrees, seems like you have the outer corner, which is 116

180-116 is 64

Also it seems like you have a symmetrical triangle, which means x is (180-64)/2

Both angles across the equal sides are themselves equal = x

And using the exterior angle theorem,,,we have that

116 = x + x

116 = 2x divide both sides by 2

58° = x