Where a horizontal plane intersects a vertical plane (VP) dihedral angles are formed, of which both the first and third angles are used in orthographic projection. Where the first dihedral angle is used (332:1) the object is placed between the observer and the vertical plane (332:2), thus the front elevation is seen first (the arrow points the direction), the side elevation is projected from it by folding back the side vertical plane on the vertical trace (VT), and placing it alongside the front elevation. The horizontal plane is then folded down on the horizontal trace (HT) XY, known as the XY line, and therefore appears below the front elevation.
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