The vertical plane is perpendicular to the—

A vertical plane stands upright and meets the level ground at a right angle, so it is perpendicular to the horizontal plane.

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C-10-Q007In the standard tree figure with vertical and on the ground, the segment represents the—
C-10-Q008In the same figure, represents the—
C-10-Q009The plane formed by points , , where is the vertical tree and is on the ground is a—
C-10-Q010Two horizontal lines drawn in the same plane are always—
C-10-Q011"Normal line" with respect to the horizontal plane means a line that is—
C-10-Q012A flagpole standing erect on level ground best represents a—
C-10-Q013The angle formed at the observer's eye by the line of sight to a point above the horizontal line is called the
C-10-Q014The angle of elevation is always measured from the—
C-10-Q015