A perpendicular line is a straight line that intersects another straight line at right angles or 90 degrees on all four sides.
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It is a straight line that intersects another straight line at right angles or 90 degrees.
What must be true? In your example, we have 4 intersecting lines. g and b are parallel, and f and h are parallel. g and b are perpendicular to f and h. It might look like tic-tac toe for example
The foot of a perpendicular is the lowest part of the perpendicular [Kinda like the feet of people]||||_____^ This is the point where the foot of the perpendicular meets the line.
A line is perpendicular to another line when it is at an angle of 90° to the other line. + (that plus sign is an example of a perpendicular line)
A line is perpendicular to a plane when it is perpendicular on two lines from the plane