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True Length and True Shape - N4/N5 Graphic Communication

An introduction to True Length and True Shape, suitable for National 4 and 5 Graphic Communication.
by

Mr O'Neill

on 11 February 2015

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Transcript of True Length and True Shape - N4/N5 Graphic Communication

True Length and True Shape
Pyramid Examples
True Length - Worked Example
What is True Length?
When we read the orthographic drawings of pyramids, are we seeing the true length of the sloping edges?
True Shape Worked Example
Prism Examples
No, because the line
'sinks'
back into the page.
Square Based Pyramid
Hexagonal Pyramid
Cone
Elevation
End Elevation
Elevation
End Elevation
Elevation
End Elevation
Imagine a ladder against a wall. Is this the true length of the ladder?
No, because the ladder is at an angle against the wall, which we don't see when we're looking at it 'straight on'.
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
What is True Shape?
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.
Only by looking at the cut face at 90° will we see the true shape.
90°
True Shape
Cylinder
Rectangular Prism
Triangular Prism
Elevation
End Elevation
Plan
True Shape
Elevation
End Elevation
Plan
True Shape
Elevation
End Elevation
Plan
True Shape
Full transcript