Create circle by center and radius API Sample

import adsk.core, adsk.fusion, traceback

def run(context):
    ui = None
    try:
        app = adsk.core.Application.get()
        ui = app.userInterface
        
        doc = app.documents.add(adsk.core.DocumentTypes.FusionDesignDocumentType)
        
        design = app.activeProduct

        # Get the root component of the active design.
        rootComp = design.rootComponent

        # Create a new sketch on the xy plane.
        sketches = rootComp.sketches
        xyPlane = rootComp.xYConstructionPlane
        sketch = sketches.add(xyPlane)

        # Draw some circles.
        circles = sketch.sketchCurves.sketchCircles
        circle1 = circles.addByCenterRadius(adsk.core.Point3D.create(0, 0, 0), 2)
        circle2 = circles.addByCenterRadius(adsk.core.Point3D.create(8, 3, 0), 3)

        # Add a circle at the center of one of the existing circles.
        circle3 = circles.addByCenterRadius(circle2.centerSketchPoint, 4)
    except:
        if ui:
            ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

#include <Core/Application/Application.h>
#include <Core/Application/Document.h>
#include <Core/Application/Documents.h>
#include <Core/Geometry/Point3D.h>
#include <Core/UserInterface/UserInterface.h>
#include <Fusion/Components/Component.h>
#include <Fusion/Construction/ConstructionPlane.h>
#include <Fusion/Fusion/Design.h>
#include <Fusion/Sketch/Sketch.h>
#include <Fusion/Sketch/SketchCircle.h>
#include <Fusion/Sketch/SketchCircles.h>
#include <Fusion/Sketch/SketchCurves.h>
#include <Fusion/Sketch/Sketches.h>
#include <Fusion/Sketch/SketchPoint.h>

using namespace adsk::core;
using namespace adsk::fusion;

Ptr<UserInterface> ui;

extern "C" XI_EXPORT bool run(const char* context)
{
    Ptr<Application> app = Application::get();
    if (!app)
        return false;

    ui = app->userInterface();
    if (!ui)
        return false;

    Ptr<Documents> docs = app->documents();
    if (!docs)
        return false;

    // Create a document.
    Ptr<Document> doc = docs->add(DocumentTypes::FusionDesignDocumentType);
    if (!doc)
        return false;

    Ptr<Design> design = app->activeProduct();
    if (!design)
        return false;

    // Get the root component of the active design
    Ptr<Component> rootComp = design->rootComponent();
    if (!rootComp)
        return false;

    // Create sketch
    Ptr<Sketches> sketches = rootComp->sketches();
    if (!sketches)
        return false;

    Ptr<Sketch> sketch = sketches->add(rootComp->xYConstructionPlane());
    if (!sketch)
        return false;

    Ptr<SketchCurves> curves = sketch->sketchCurves();
    if (!curves)
        return false;

    // Draw some circles.
    Ptr<SketchCircles> circles = curves->sketchCircles();
    if (!circles)
        return false;

    Ptr<SketchCircle> circle1 = circles->addByCenterRadius(Point3D::create(0, 0, 0), 2);
    if (!circle1)
        return false;

    Ptr<SketchCircle> circle2 = circles->addByCenterRadius(Point3D::create(8, 3, 0), 3);
    if (!circle2)
        return false;

    // Add a circle at the center of one of the existing circles.
    Ptr<SketchCircle> circle3 = circles->addByCenterRadius(circle2->centerSketchPoint(), 4);
    if (!circle3)
        return false;

    return true;
}