"Perpendicular" describes the relationship between two lines. A single line can't be 'perpendicular'.
Two lines are perpendicular if
1). they cross each other
2). at the place where they cross, they form 90-degree angles
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A line of best-fit.
A straight line, a telephone line, a shipping line, a fishing line.
A line intersect is a point on a line where another line or object crosses the line.
In geometry a line is thought of as extending infinitely in both directions. A line segment is part of a line.
Lines r and m are parallel or line r is line m continued