If two lines are parallel then the area of the plane between them is symmetrical about its centre-line (parallel to and mid-way between the boundary lines).
pickles...
It is a rotation.
Glide Reflection
The hyperbola is the curve at the boundary of the intersection of the conewith a cutting plane parallel to the cone's axis.
38th parallel. Boundary known as between North Korea and South Korea
The Oregon Treaty set the boundary at the 49th Parallel.
38th parallel
Spain.
49 Parallel
It remained at the 38th Parallel.
In 1802, the Mississippi River formed the western boundary of the United States. The southern boundary extended to the 31st parallel north latitude.
translation
If two lines are parallel then the area of the plane between them is symmetrical about its centre-line (parallel to and mid-way between the boundary lines).
July 1953 was when the armistance that 'ended' the Korean war was signed and the 38th parallel was established as a boundary.
Forty-ninth Parallel
Korea and china