DrawArc

DrawArc(Pen, RectangleF, float, float)

public void DrawArc(Pen pen, RectangleF rect, float startAngle, float sweepAngle)

也可以看看


DrawArc(Pen, float, float, float, float, float, float)

public void DrawArc(Pen pen, float x, float y, float width, float height, float startAngle, 
    float sweepAngle)

也可以看看