Arc

Alias: A

Creates an arc defined by a centre point, start point, and end point.

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Description

The Arc command creates a circular arc. The arc is defined by specifying a centre point, then the start point and end point in an anti-clockwise direction.

Workflow

1. Type A and press Space or Enter.

2. Specify centre point: Click the centre of the arc.

3. Specify start point: Click the point where the arc begins.

4. Specify end point: Click the point where the arc ends.

Note

The arc is drawn anti-clockwise from the start point to the end point.

Tips

• Use object snap to align the start or end of the arc precisely with existing geometry.

• To create a precise arc, type coordinates for each point rather than clicking.

• Arcs can be used as cutting edges in trim.

DXF Representation

An arc is stored as an ARC entity in the DXF ../dxf BLOCKS section. An ARC shares the same group codes as CIRCLE with the addition of start and end angles.

0
ARC
8       ← layer name
0
10      ← centre X
50.0
20      ← centre Y
50.0
40      ← radius
25.0
50      ← start angle (degrees, anti-clockwise from positive X)
30.0
51      ← end angle (degrees, anti-clockwise from positive X)
150.0

Angles are always measured anti-clockwise from the positive X-axis.

See Also

Circle | trim | ../dxf