1 1 1
butter

1 1 100
butter

1 1 900
bread

1 1 1000
bread

100 10 1000
butter

1 1 469
butter

1 1 470
bread

Why you have
1 1 470 - bread
and
1 1 469 - butter?

1 1 469
time = 0.045152364098573095
speed = 7.816666666666666
N = time*speed = 0.352940979370513
angle = 127.05875257338468. So it must be bread;

and

1 1 470
time = 0.045152364098573095
speed = 7.833333333333333
N = time*speed= 0.3536935187721559
angle = 127.32966675797611

So for both variants we get bread.
Am i not right ?

Oh.. Proba, sorry. Now see problem. thank you for tests :)

why you are using speed, you need only angle for which you dont need speed

sorry it was stupid question:)

Thanks for tests...
If you have WA#23 usind C# remember that Math.Sqrt(-1) = NaN :)

3Q for your tests!