-Perpendicular Bisector: line that bisects a different line segment into 2 equal parts.
-Perpendicular: 2 lines that intersect at a 90 degree angle.
-Parallel Lines: 2 lines on the same plane that never meet. (same distance apart)
-Intersecting: 2 lines that cross, 'intersect', at any point.
-Angle Bisector: dividing the angle into 2 equal parts.
eg. 90 degrees divided into two is 45 degrees.