June 8, 2016 - There seems to be a problem in lesson 11 (Feeling included for Ruby Object-Oriented Programming II)

The exercise outlines to add "include Math" in line two to use method cos without scope resolution operator. This however, will raise an issue in the interpreter box which stated something like that method "cos" cannot be resolved.

As a work-around I added a module Math prior to the class Angle which includes it. My own module Math contains a dummy method cos which takes radius as parameter.

https://www.codecademy.com/courses/ruby-beginner-en-zfe3o/1/5?curriculum_id=5059f8619189a5000201fbcb

```
module Math
def cos(radius); end
end
class Angle
include Math
attr_accessor :radians
def initialize(radians)
@radians = radians
end
def cosine
cos(@radians)
end
end
acute = Angle.new(1)
acute.cosine
```