[Solved] The measuring line or the line of heights is the trace or the line of intersection with the picture plane, of the plane containing the point or points whose heights are to be determined.

Q.	The measuring line or the line of heights is the trace or the line of intersection with the picture plane, of the plane containing the point or points whose heights are to be determined.
A.	ground plane
B.	picture plane
C.	vertical plane
D.	central plane
Answer» C. vertical plane
Explanation: the measuring line or the line of heights is the trace or the line of intersection with the picture plane, of the vertical plane containing the point or points whose heights are to be determined.

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