What do you mean by "In the comics, Angel is a black girl but is portrayed definitely in the film X-Men First Class"? All that is saying that Angel is a black girl in the comics and the movies, which is not really trivia worthy.
In the comics Angel Salvadore looks like Storm, Bishop, Daniels, John Wraith and Darwin she has the same skin color as them. But here on this wiki she is listed as Hispanic - Latino, Mexican so she is completely different from her comic book version.
I am not trying to make things confusing or make a mess of things I am just trying to let people know the difference between the comic book version and the movie version of Angel Salvadore.