It has no specific name.
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(-4+12)/2= 4
Precisely midway. That is to say, at their mean (average).
A point - unless the line lies within the plane, or is parallel to it.
A parabola is the figure formed by the intersection of a circular cone and a plane that lies parallel to the edge of the cone. (the cone does not have to be a right [90°] circular cone).
All lines of longitude are equal. The longest line of latitude is the Equator.