[Solved] The line formed by intersection of principal planes is called

Q.	The line formed by intersection of principal planes is called
A.	projection line
B.	origin line
C.	line of intersection
D.	reference line
Answer» D. reference line
Explanation: the line formed by an intersection of principal planes or reference planes of projection that is the vertical plane or frontal plane and horizontal plane is called reference line which is denoted by the letters xy.

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