They are called rays.
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A perpendicular line is a type of intersecting line that crosses the other line at a right angle.
No.
A line is orthogonal to another if it is at 90° to it. You can call lines that intersect at 90° orthogonallines.You can also say that the lines form a right angle.
perpendicular or orthogonal
Yes. A t has a perpendicular line but in order to form a right angle you need to have the lines intersect.