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Arc

The Arc tool is used to draw circular arcs. Arcs can be defined five ways (see Construct below). The options below can be selected from the bottom app bar or from the control panel.

The Layer option selects the layer on which new objects are created. Selecting a layer also selects the default color, line type, and line thickness used to draw the object. These properties can be overridden using the Properties tool. Layers are also used to logically group objects within the drawing. Layers can be created, modified, and hidden in the Layer definitions settings panel.
The Construct option determines how the points that you enter are used to define the object being created. In this case there are seven ways that you can define an arc:

Center/start/end
The arc is defined by locating its center point, the point at which the arc starts (defining the radius), and a point to define the end of the arc.
Three point
The arc is defined by locating its start point, any point on its circumference, and its end point.
Semi-circle
A semi-circle is drawn counter-clockwise between two points.
Radius
The arc is defined by locating its center point, a point defining its start angle, and point defining its end angle, and a radius value. When this option is selected the Radius option described below is enabled.
Radius & angles
The arc is defined by locating its center point, and entering explicit values for its radius, start angle, and included angle. When this option is selected the Radius and Angles options described below are enabled.
Fillet
The arc is drawn tangent to two intersecting lines. The intersecting lines are defined by entering three points, A, B & C. The arc is drawn from the tangent point A on line AB to the to the tangent point on line BC. [this feature is available in version 2.0.1.6]
Fillet & radius
The arc is drawn tangent to two intersecting lines. The intersecting lines are defined by entering three points, A, B & C. The arc is drawn with the specified radius from the tangent on line AB to the to the tangent point on line BC. When this option is selected the Radius option described below is enabled. [this feature is available in version 2.0.1.6]
The Fill option specifies the color (if any) that will be used to fill the object. The following options are available.
No fill
The object is not filled
Use layer color
The object is filled using the color property of the object's layer
Use outline color
The object is filled using the color of the object's outline
Select a new color
An explicit color is selected for the fill using the Color Picker
[Recent colors...]
Choose from a list of colors that were recently selected in the Color Picker
The Radius option allows you to specify an explicit radius for new arcs. The radius value is specified in model (real world) units when working in a scaled drawing. This option is only available when the "radius" construction option is selected.
The Angles option allows you to specify an explicit values for the arc's start and included angles. The start angle is specified in degrees counter-clockwise from horizontal. The included angle is specified in degrees counter-clockwise from the start angle. This option is only available when the "Radius & angles" construct option is selected.
The Edit Last option gives you an opportunity to modify the points used to define the last object created without leaving the current tool. This can be especially useful when using touch input because touch is an inherently imprecise way to locate points. You can use the arrow keys on the keyboard or control panel to fine-tune the location of each point. When you finish editing the object (by deselecting it) you will return to the current tool.