Arc

In one sentence: Draws a circular arc by specifying centre point, radius, start angle, and aperture angle.

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Overview

Workbench: Draft
Menu: Draft → Drafting → Arc Tools → Arc
Command: Draft_Arc

Classic three-step arc construction: centre → radius → start angle → end angle. Use Arc by 3 Points if you know points the arc must pass through.

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Step-by-step

1. Activate Draft → Drafting → Arc Tools → Arc.
2. Pick the centre point.
3. Move the cursor to set the radius (or type a value).
4. Click to set the start angle on the circle.
5. Click to set the end angle (the aperture).

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Key properties

Property	Description
Radius	Circle radius
First Angle	Start angle in degrees, measured from X-axis
Last Angle	End angle — arc sweeps from First to Last

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Python API

import Draft

arc = Draft.make_circle(
    radius=30,
    face=False,
    startangle=0,
    endangle=90,
    placement=App.Placement(App.Vector(0, 0, 0), App.Rotation())
)
App.ActiveDocument.recompute()

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See also

• Arc by 3 Points — arc through three known points
• Circle — full circle
• Draft Workbench — workbench overview