In two dimensional space they must. In three (or more) dimensions they need not.
yes they can
They are lines that intersect at 90 degrees
No. Parallel lines do not intersect; perpendicular lines intersect at 90 degrees
They are lines that intersect one another at 90 degree angles.
Perpendicular lines intersect at right angles which is 90 degrees
Perpendicular lines are lines that intersect at a right angle (90 degrees).
Pair of lies crossing at right angles at the origin.
Not necessarily. Consider two lines that intersect at some angle other than 90 degrees. Then the angle of intersection is not 90 degrees means they are not perpendicular. But, because they intersect, neither are they parallel.
no they don't have perpindicular lines
Perpindicular lines are like the lines in the letter "T". The intersect each other at a 90 degree angle. A radius is the distance from the center of the circle to the circle itself. It is half the circle's diameter.
First of all, it is spelled perpindicular, not perpandiculer. Secondly, perpindicular lines are two lies that cross forming right angles, or 90 degree angles. For example, the two lines forming a plus sign are perpindicular.
lines and line segments