Orthogonal projection {first angle projection} can be on bottom horizontal plane {plan projection, first angle}, back left vertical plane {front elevation, first angle}, and back right vertical plane {side elevation, first angle} {end elevation, first angle}. Front and plan are like looking into far lower corner from outside room.
Mathematical Sciences>Geometry>Projections>Object Onto Planes>Orthogonal
3-Geometry-Projections-Object Onto Planes-Orthogonal
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Date Modified: 2022.0224