Sine and Cosine are rebelling!

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Diablo

try

Graphics 320, 200
For Local a = 0 To 900
Local r:Float = Rnd(360)
Local x:Float = 20* Sin(r)
Local y:Float = 20* Cos(r)
Plot 160+x,100+y
Next
Flip
WaitKey

you need to make sure your cos'ing and sin'ing the same number

Edit Even:
Graphics 320, 200
For Local a = 0 To 900
Local r:Float = Rnd(360)
Local d:Float = Rnd(20)
Local x:Float = d* Sin(r)
Local y:Float = d* Cos(r)
Plot 160+x,100+y
Next
Flip
WaitKey