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The measurements are taken at right angle to the survey line called perpendicular or right angled offsets. The measurements which are not made at right angles to the survey line are called oblique offsets or tie line offsets.
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