Haskell random tests include values of n that are $\le 2$. I made a fork that fixes it.

in sql, the description does not specify wether the output table should have 2 columns or only the res column. That being said, I do believe that outputting 2 columns, the number of angles and the total sum of angles is much better coding practice than just outputting one column just

Schema of input and desired output tables are not described, seems like test cases are whack too.

Well, the random_tests actually sometimes include input that is <= 2!
Thus the statement N will be greater than 2 is incorrect!

E.g. this code in Rust:

fn angle(n: u32) -> u32 {
    assert!(n > 2, "invalid input: n must be bigger than 2");
    // ...
}

sometimes does not pass the random_tests and says:

 Test Failed
invalid input: n must be bigger than 2