How to rotate a circle?!

[meteor]

hi! How do I rotate a circle on the X and Y Axis?!

here is the code I use to draw the circle..

Dim t As Double, x As Double, y As Double, r As Double, i As Integer
   Const pi As Double = 3.14159265358979
   r = 32
   Me.Picture1.Cls
   Me.Picture1.Circle (64, 64), r, vbRed 'original red circle of r=32 and center (64,64)
   For i = 0 To 359
      t = (i * pi) / 180 'angle of rotation, in radians
      x = 64 + (r * Cos(t))
      y = 64 + (r * Sin(t))
      SetPixel Me.Picture1.hdc, x, y, vbYellow 'draw the circle point by point
      DoEvents
   Next i