| Name | Description | 
| addByCenterRadius | Creates a sketch circle that is always parallel to the x-y plane of the sketch and is centered at the specified point. | 
| addByThreePoints | Creates a sketch circle that passes through the three points. The three points must lie on the x-y plane of the sketch. | 
| addByThreeTangents | Creates a sketch circle that is tangent to the three input lines. The three lines must lie on the x-y plane of the sketch. | 
| addByTwoPoints | Creates a sketch circle where the circle passes through the two points and the distance between the two points is the diameter of the circle. | 
| addByTwoTangents | Creates a sketch circle that is tangent to the two input lines. The two lines must lie on the x-y plane of the sketch. | 
| classType | Static function that all classes support that returns the type of the class as a string. The returned string matches the string returned by the objectType property. For example if you have a reference to an object and you want to check if it's a SketchLine you can use myObject.objectType == fusion.SketchLine.classType(). | 
| item | Function that returns the specified sketch circle using an index into the collection. | 
| Name | Description | 
| count | Returns the number of circles in the sketch. | 
| isValid | Indicates if this object is still valid, i.e. hasn't been deleted or some other action done to invalidate the reference. | 
| objectType | This property is supported by all objects in the API and returns a string that contains the full name (namespace::objecttype) describing the type of the object. It's often useful to use this in combination with the classType method to see if an object is a certain type. For example: if obj.objectType == adsk.core.Point3D.classType():  | 
      
| Name | Description | 
| Create circle by center and radius API Sample | Demonstrates creating a sketch circle by the center and radius. | 
| Create Circle By 3 Tangents API Sample | Creates three lines and then draws a circle that is tangent to the lines. It then creates tangent constraints to maintain that relationship. | 
| Loft Feature API Sample | Demonstrates creating a new loft feature. | 
| Patch Feature API Sample | Demonstrates creating a new patch feature. | 
| Simple Extrusion Sample | Creates a new extrusion feature, resulting in a new component. | 
| Simple Revolve Feature Sample | Creates a new revolve feature, resulting in a new component. | 
| SketchCircles.addByCenterRadius | Demonstrates the SketchCircles.addByCenterRadius method. | 
| SketchCircles.addByThreePoints | Demonstrates the SketchCircles.addByThreePoints method. | 
| SketchCircles.addByThreeTangents | Demonstrates the SketchCircles.addByThreeTangets method. | 
| SketchCircles.addByTwoPoints | Demonstrates the SketchCircles.addByTwoPoints method. | 
| SketchCircles.addByTwoTangents | Demonstrates the SketchCircles.addByTwoTangets method. |