Question

How many points are required to bisect a side?
(A) 0 (B) 1 (C) 2 (D) 3​

Answer 1

In geometry, bisection is the division of something into two equal or congruent parts, usually by a line, which is then called a bisector. The most often considered types of bisectors are the segment bisector (a line that passes through the midpoint of a given segment) and the angle bisector (a line that passes through the apex of an angle, that divides it into two equal angles).

Line DE bisects line AB at D, line EF is a perpendicular bisector of segment AD at C, and line EF is the interior bisector of right angle AED

In three-dimensional space, bisection is usually done by a plane, also called the bisector or bisecting plane.