Matter Physics & Triangle

Phaser 3
1

Hello,

I am using matter physics in my phaser project.

I am creating a circle with add.circle :

this.circle = this.add.circle(100, 350, 50, 0xffffff);
        this.matter.add.gameObject(this.circle, {
            isStatic: true,
            shape: 'circle',
            render: {
                sprite: {
                    yOffset: 0
                }
            } 
        });

Yes, it works as i coded.
But i want to add a triangle as this.

this.triangle = Phaser.Geom.Triangle.BuildEquilateral(400, 200, 200);
this.matter.add.gameObject(this.triangle,{isStatic: true,render: { sprite: { yOffset: 0} }});

this.graphics = this.add.graphics({ lineStyle: { width: 2, color: 0xff0000 },fillStyle: { color: 0xaaaa00 } });
this.graphics.strokeTriangleShape(this.triangle);
this.graphics.fillTriangleShape(this.triangle);

Triangle shows in my canvas but matter physics doesnt effect on that.

I dont know why? Is there anyone to help to understand this.
Thanks.