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Filleting connects two objects with a smoothly fitted arc of a specified radius. An inside corner is called a fillet and an outside corner is called a round; you can create both using FILLET in AutoCAD

You can fillet
Arcs
Circles
Ellipses and elliptical arcs
Lines
Polylines
Rays
Splines
Xlines
Using FILLET is also a convenient method of creating an arc with a specified radius that is tangent to two selected objects. FILLET can be used to round all corners on a polyline using a single command.
If both objects being filleted are on the same layer, the fillet arc is created on that layer. Otherwise, the fillet arc is created on the current layer. The layer affects object properties including color and linetype.
Use the Multiple option to fillet more than one set of objects without leaving the command.

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  • Many drafting applications use a process called hatching to fill an area with a pattern. The pattern is used to differentiate components of a project or to signify the material composing an object.
    You can use a predefined hatch pattern, define a simple line pattern using the current linetype, or create more complex hatch patterns.
    You can also create a gradient fill, which uses a transition between shades of one color or between two colors. Gradient fills can be used to enhance presentation drawings, giving the appearance of light reflecting on an object, or they can be used as interesting backgrounds in logos.
    You can drag and drop hatches from a tool palette or use a dialog box with additional options

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