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When we read the orthographic drawings of pyramids, are we seeing the true length of the sloping edges?
No, because the line 'sinks' back into the page.
Plan
When we see the cut face of a prism or pyramid, does the plan or end elevation show the correct size of this face?
No, because the true lengths are not represented in these views.
None of the orthographic views look at the cut face at 90° so the true lengths are not seen.
True Shape
Plan
End Elevation
Elevation
True Shape
Elevation
End Elevation
No, because the ladder is at an angle against the wall, which we don't see when we're looking at it 'straight on'.
Elevation
End Elevation
Elevation
Imagine a ladder against a wall. Is this the true length of the ladder?
End Elevation
Only by looking at the cut face at 90° will we see the true shape.
90°
True Shape
End Elevation
Elevation
So, to see the true length we need to rotate the sloping edge so that we're looking at it at 90°. True lengths are longer than their vertical height shown on the elevation.
90°
True Length
Plan
True Shape
Elevation
End Elevation