Somebody Help me out

[JetFixxxer]

I'm here http://randscullard.com/CircleOfFifths/

Trying to figure out the bold part is hurting my head.. I can't see WTF they are talking about.

The outermost ring, the Chord Ring, shows you what type of three-note chord, or triad, is rooted at each of the seven notes in the selected key. For example, in C Major, the triad rooted at D (that is, D-F-A) is a minor chord, but in G Major, the triad rooted at D (D-F-A) is instead a major chord.

Wouldn't C Major be C-E-G? Wouldn't G Major be G-B-C?

Spent the last 15 minutes.. trying this one as well.. again just the bold.

for example, the G Major triad appears in the keys C Major, G Major, and D Major. Now look at the seventh chords based on that triad. Gmaj7 consists of the notes G, B, D, and F#. Using the Circle, you can see that these notes occur in only two out of the three keys: G Major and D Major. G7 (the dominant seventh) consists of G, B, D, and F, and only the remaining key, C Major, has all of these notes.

If I chose D Major D, F#, A, C# that doesn't look like the same notes in G Major.. except for the D and F#...

I really should have been in bed an hour go.. but noooooooooooooo I had to stop by and try to figure something out.... only to have it kick my ass.