A perpendicular bisector goes through the median of the line while a perpendicular line can be anywhere on the line as long as it is at a 90 degree angle.
Parallel lines never touch each other, they run side by side, like railroad tracks, or this equal sign = Perpendicular lines cross each other at 90 degrees, so it looks like a t or a plus sign, +
Set a compass to draw a circle with a radius that's more than half the length of the line segment but less than the whole length. Put the compass point at one end of the segment and draw an arc above...