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2D sketching tools in 3D design create flat shapes like rectangles and circles.

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Flat shapes: rectangle, circle, etc.

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Term 'extrude' in 3D design refers to features that create non-flat shapes like extrude and revolve.

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Features that create non-flat shapes - extrude, revolve.

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Definition of 'perpendicular' in 3D design

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At an angle of 90° to a given line, plane, or surface

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Fillet in engineering and design refers to:

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Rounded corner or transition between two surfaces.

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'Parallel' means:

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side by side with equal distance.

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Concentric:

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Circles or arcs sharing the same center.

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Horizontal: object goes left and right

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left and right

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Origin?

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The point or place where something begins.

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In OnShape, a plane is a 3D surface for design.

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3D surface for design

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3D sketching tools:

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extrude / revolve