Bisector of a segment<span> – line, ray </span>segment<span>, or plane that </span>divides a segment into two congruent segments<span>. Midpoint of a </span>segment<span> – </span>a point that divides<span> the</span>segment into two congruent segments<span>. Acute angle – angle whose measure is between 0 degrees and 90 degrees. Right angle – angle whose measure is 90 degrees.</span>