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Circle

  • Updated

This command draws circles by two points, three points, and by tangent, tangent, and radius; it also converts arcs to circles.

Accessing the Command

command bar: circle
alias: c
menu bar: Draw | Circle
toolbar: Draw |
ribbon: Draw | Draw | Circles

: circle

You are prompted:

Select center of circle or [2Point/3Point/TTR/Arc/Multiple]: (Pick a point, or enter an option)

Set Radius or [Diameter] <x.xx>: (Pick a point, enter a distance, or type D to define the diameter)

The complete list of circle drawing methods is summarized by the Draw | Circle menu:

In the icons, the larger green dot indicates the starting point, the smaller green dots the additional pick points. When an icon has all small dots, then the pick order does not matter.

Command Options

Option

Description

Select center of circle

Specifies the center of the circle:

  • Enter x,y,z coordinates
  • Pick a point in the drawing

The z coordinate is rarely entered, so most often you enter x,y coordinates.

Diameter

After you pick the center point, this prompt asks you to specifies the diameter of the circle:

Diameter of circle - (enter a distance, coordinates, or pick a point)

Set Radius

After you pick the center point, this prompt asks you to specify the radius of the circle:

Radius of circle - (enter a distance, coordinates, or pick a point)

2Point

Defines the circle by two points that you pick on its circumference; prompts you:

  1. First point on diameter - (enter coordinates, or pick a point)

  2. Second point on diameter - (enter coordinates, or pick another point)

The abbreviation for this option is 2P.

3Point

Defines the circle by three points that you pick on its circumference; prompts you:

  1. First point on circle - (enter coordinates, or pick a point)

  2. Second point - (enter coordinates, or pick another point)

  3. Third point - (enter coordinates, or pick another point)

The abbreviation for this option is 3P.

RadTanTan

Defines the circle by two points that are tangent to other entities, along with the radius. A tangent is where a circle touches another entity. The Tangent entity snap is activated automatically during the first two prompts:

  1. Select first tangent point - (enter coordinates, or pick an entity)

  2. Select second tangent point - (enter coordinates, or pick another entity)

  3. Radius of circle - (specify a distance, or pick two points)

The abbreviation for this option is RTT.

Arc

Converts arcs to circles by closing them; prompts you:

Select arc to convert to circle - (Choose an arc)

Multiple

Repeats the command until you press Esc.

Procedures

Grips Editing

Circles can be edited directly through grips:

  1. Select the circle. Notice that it has five grips.

  2. Drag the grips to perform the following actions:

  • Drag the quadrant grips to stretch the circle (increase and decrease the radius).
  • Drag the center point grip to move the circle.

Related Commands

Ai_CircTan - draws a circle tangent to three entities.

Arc - draws arcs.

Change - changes the diameter of circles.

Ellipse - draws ellipses.

Join - joins arcs to create circles.

Donut - draws fat circles from polyline arcs.

DimRadius and DimDiameter - dimensions circles.

Center - snaps to the center of circles.

Quadrant - snaps to the 90-degree points on the circumference of circles.

Tangent - snaps to the tangency of circles.

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