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At what angle do the projection planes lie in orthographic projections?
90°
What is the fold line in Multiview projection?
The line where the vertical and horizontal planes meets.
Why is multiview projection useful?
It makes it possible to for us to draw 3D objects.
On which plane is the front view drawn?
The vertical plane
Why are dotted lines used in Multiview projections?
They are used to show unseen edges blocked by the front view.
How do we determine the front view?
The view that gives the most information about the object.
What is the dihedral system?
The process of representing 3D objects on flat drawing surfaces using different views.
What is another name for the side view?
Profile
Name the three views that are needed when doing Multiview projections.
Elevation or front view Plan or top view Profile or sideview
What is another name for the fold line?
Reference line, Line of Intersection or Ground line
What are the basic elements of Multiview Drawing?
Vertical plane, horizontal plane and fold line
How many images of an object are produced in Multiview projections?
At least 2
In dimension sketches all measurements are assumed to be in _______________.
millimetres
What are Extension lines in Dimensioned sketches?
They are the lines that join the dimension lines to the side of the object that is represented.
What are the essential elements for labelling a dimensioned sketch?
Dimension or measurement lines, Extension lines and Dimension or measurement values.
Sketches should give ________________________________.
all the necessary information about an object
The proportions of a dimensioned sketch should be approximately ____________.
accurate
What is a dimensioned sketch?
A drawing that shows the shape of a three-dimensional object along with the measurements of the object.
Define Trimetric projection.
A type of Axonometric projection in which none of the angles are equal.
Define Dimetric projection.
A type of Axonometric projection in which two of the three angles are equal.
Define Isometric projection.
A type of Axonometric projection in which the axes form 3 equal angles.
What are the three most common types of Axonometric projection?
Isometric, Dimetric and Trimetric projection.
What are the basic elements of Axonometric projection?
Three intersecting coordinate planes. Three axes ( X, Y and Z) .
What is Axonometric projection?
A type of Multiview orthographic projection used to represent three-dimensional objects on a two-dimensional Surface.
In the Oblique projection of a cube the X and Y axes give the _________ and _________ of the figure.
height , width
Which angle is most commonly used for the X and Y axes in Oblique projections?
135° angle
In Oblique projections the X and Z axes always________________________.
Form a 90° angle.
What does oblique mean?
Neither parallel nor perpendicular. It's slanted or at an angle.
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