True Shape View of Oblique Face

Object with oblique face Would be better if face were scalene triangle

Normal Multiview

Multiview fold lines

Edge appears in true length Find a view in which an edge appears TL. Why? Because a projection from that view will show F as Edge. Why is that? Need some theory of ortho projections for full ans but short ans is “TRY IT WITH A SMALL FACE!” Why do I need to see F on Edge? Because, little one, you can then do just one more projection and then see it in glorious TSHAPE

Multiview point labels How do you know that Line is TL? It lies in a plane parallel to one of the orthographic projection planes!

Primary projection lines Why are lines in that direction? They could be in any direction, right? Uh, no. Projection has to be such that you see that TL line as a POINT. To do that, the projection direction must be parallel to the line.

Primary fold line

Primary distances

Primary point labels

Primary auxiliary view

Face ABC appears on edge

Secondary projection lines Why proj lines in that dir? b/c to see the TS, we have to look perpto the face, thus perpto the edge view of that silly face.

Secondary fold line

Secondary distances

Secondary point labels

Secondary auxiliary view

Face is in true shape

Object with oblique face