Constructing Circles

You can use one of several methods to create Circles.

To construct a Circle from its center point and radius:

1. Click Draw > Circle > Center, Radius (or type Circle).
2. In the graphics area, click to define the:
1. Center point of the Circle.
2. Circle radius, or enter the radius at the command prompt.

To construct a Circle from its center point and diameter:

1. Click Draw > Circle > Center, Diameter.
2. In the graphics area, click to define the:
1. Center point of the Circle.
2. Circle diameter, or enter the diameter at the command prompt.

To construct a Circle from three points:

1. Click Draw > Circle > 3 Points (or type Circle then specify the 3Point option).
2. In the graphics area, select three points that define points on the Circle.

To construct a Circle from two points along the diameter:

1. Click Draw > Circle > 2 Points (or type Circle then specify the 2Point option).
2. In the graphics area, select two points that define the Circle diameter.

To construct a Circle from two tangent entities and the radius:

1. Click Draw > Circle > Tangent, Tangent, Radius (or type Circle then specify the Ttr option).
2. In the graphics area:
1. Select a point on each of two linear entities that define lines tangent to the Circle.
2. Click twice point to define the radius, or enter the radius at the command prompt.

To construct a Circle that is tangent to three lines:

1. Click Draw > Circle > Tangent, Tangent, Tangent (or type Circle then specify the TTT option).
2. In the graphics area, select a point on three linear entities that define lines tangent to the Circle.

 This option is useful when inscribing the Circle within a regular polygon.

Access

Command: Circle

Menu: Draw > Circle