How do I draw a triangle?

[Mikeeeeee]

Hi!
How do I draw a triangle?
It is not work:

Canvas{
                        contextType: "2d"
                        anchors.fill: parent
                        onPaint: {
                            context.reset();
                            context.moveTo(0, 0);
                            context.lineTo(width, 0);
                            context.lineTo(width / 2, height);
                            context.closePath();
                            context.fillStyle = control.pressed ? "green" : "red";
                            context.fill();
                        }
                    }

And https://doc.qt.io/qtdesignstudio/qml-qtquick-studio-components-triangle.html
QML not found QtQuick.Studio.Components 1.0

[Markkyboy]

@Mikeeeeee - Nest Canvas in Window

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    visible: true
    width: 320
    height: 240
    title: qsTr("Triangle")

    Canvas {
        id: yellowTriangle
        width: 110; height: 110
        anchors.centerIn: parent
        onPaint: {
            var ctx = getContext("2d")

            // the equliteral triangle
            ctx.beginPath();
            ctx.moveTo(55, 10);
            ctx.lineTo(10, 90);
            ctx.lineTo(100, 90);
            ctx.closePath();

            // outline
            ctx.lineWidth = 10;

            // outline color
            ctx.strokeStyle = '#000000';
            ctx.stroke();

            // fill color
            ctx.fillStyle = "#FFCC00";
            ctx.fill();
        }
    }
}