The abbreviations are:
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Perpendicular
A line is perpendicular to a plane when it is perpendicular on two lines from the plane
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.
The diagonals of a rhombus are perpendicular
A perpendicular line is 90 degrees. Anything less or more is not perpendicular.