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If a line AB parallel to both the horizontal plane and vertical plane then the line AB is _____________

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If a line AB parallel to both the horizontal plane and vertical plane then the line AB is _____________

(a) parallel to profile plane

(b) lies on profile plane

(c) perpendicular to profile plane

(d) inclined to profile plane

The question was asked in examination.

The query is from Projection of Straight Lines Parallel to Plane topic in section Projection of Lines of Engineering Drawing

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Right option is (c) perpendicular to profile plane

To explain I would say: For any line if it is parallel to two perpendicular planes then the line will definitely perpendicular to other plane perpendicular to both the previous planes. And whether the line lies on the plane or not depends on conditions given but we can’t just imagine.

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