Perpendicular rays are two rays that intersect one another to form four right angles. Below is an image that shows two perpendicular rays.
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sides of a right angle
Two lines of a plane are said to be parallel if they do not intersect and the perpendicular distance betweem them is always same.
Depending on the location of the intersection, there are many things though could be formed, but to pick commons, it could form a +, T, L
Stigmatism doesn't meant anything in geometry and is not even a word. Astigmatism, however, is where rays in an optical system propagate in two perpendicular planes that have different focus.
Yes, the middle of the figure would make exactly four right angles if there were two lines (rays or line segments) in the figure. By:Donny Heitler