Autodesk AUTOSKETCH 8, User Manual

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Chapter 13 Arcs & Circles
An arc is a segment of a circle defined by a centerpoint, radius, starting angle,
and included angle. Two geometric properties define a circle: the center-
point and radius. You can change these properties by selecting an arc or circle
and changing the corresponding settings on the edit bar.
You can draw a circular arc by specifying any of the following:
■
Startpoint, endpoint, and a point on the arc
■
Startpoint, endpoint, and centerpoint
■
Startpoint, endpoint, and included angle
An elliptical arc is an ellipse with less than 360 degrees. You can draw an
elliptical arc by specifying any of the following:
■
A rectangle using two points (in which an ellipse is tangent to all four
sides), start angle, and included angle
■
Major and minor axes using three points, start angle, and included angle
You can draw a circle by specifying any of the following:
■
Centerpoint and a point on the circle
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Two points on opposite sides of the circle
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Three points on the circle.
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Centerpoint and radius
■
Radius and two entities to which the circle is tangent
■
Three entities to which the circle is tangent