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What does Bisection of a line means?

Bisection is the division of something into two equal or congruent parts, usually by a line, which is then called a bisector.
What do we mean by perpendicular bisector?

A perpendicular bisector is defined as a line or a line segment that divides a given line segment into two parts of equal measurement. 'Bisect' is the term used to describe dividing equally. Perpendicular bisectors intersect the line segment that they bisect and make four angles of 90° each on both sides. Perpendicular means a line or a line segment making an angle of 90° with another line or line segment. In the figure shown below, the perpendicular bisector bisects the line segment AB into two equal halves.

What does Trisection of a line means?
trisection means dividing the line segment into three equal parts in the
1:1:1
or dividing the line segment in the ratio 1:2 or 2:1 internally.