Hemispheric line
It is a bisector.
3?4
A bisector
A bisector divides an angle in half (usually in the form of a line passing through the centre of the angle).
To bisect is to cut or divide into halves. A bisecting line would then be a line that divides another line in half or a line that divides an angle in half.
A bisecting line.
Hemispheric line
Angle bisector
the Equator
symmetry
It is a bisector.
3?4
A bisector
The midpoint divides a line segment in half.
boundary line
A bisector divides an angle in half (usually in the form of a line passing through the centre of the angle).