When a line divides another in two equal parts, it is called a bisector. If the bisector happens to cross the other line at right angles, it is called a perpendicular bisector.
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A line of symmetry divides a figure into two matching halves.
What is axis of symmetry? the axis of symmetry is a line that divides a planar figure into two congurent reflected halves
The sagittal plane, also known as the vertical plane, is the imaginary line that separates anterior from posterior. This plane is referenced when dealing with any anatomical diagram.
boundary line
a symmetrical line.