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If a plane is perpendicular to vertical and inclined to horizontal plane with 30 degrees then the vertical trace makes _______ degrees with xy reference.

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If a plane is perpendicular to vertical and inclined to horizontal plane with 30 degrees then the vertical trace makes _______ degrees with xy reference.

(a) 30 degrees

(b) 60 degrees

(c) 150 degrees

(d) 90 degrees

The question was posed to me at a job interview.

I want to ask this question from Projection of Planes Inclined to one of the Reference Plane & Perpendicular to other topic in chapter Projection of Planes of Engineering Drawing

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The correct option is (a) 30 degrees

The best explanation: When a plane is perpendicular to one of the reference planes and inclined to the other, its inclination is shown by an angle which its projection on the plane to which it is perpendicular, makes with xy. And converse for traces.

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