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