Trig Functions "to-radians" and "from-radians"

[Tom Browder]

Those two functions are documented here:

http://design.perl6.org/S32/Numeric.html#Trigonometric_functions

but I have tried to use them with no luck:

  say 10.to-radians(Degrees);

Undeclared name:
    Degrees used at line 9

So how does one use the two functions?

Best,

-Tom