Not sure what you mean, but if you mean A/C, that means an A chord played over a C in the bass.
A C and F chord
A chord with the fourth in it. C fourth chord is C F and A, although, it's not really called a fourth, it's called a suspension or suspended chord.
The notes in a C major chord are C, E, and G.
The notes of a C chord on the guitar are C, E, and G.
Means it's a chord were C is the fundamental note. The fundamental note, is the note from were the chord is constructed. So if it's a C major chord, it could be C E G or C E G B
The main difference between playing a C major chord and a C minor chord on the guitar is the third note in the chord. In a C major chord, the third note is E, while in a C minor chord, the third note is E flat. This difference in the third note gives each chord a distinct sound and feeling.
That is called the "base" of the chord. Try not to get this word confused with "root," which is the lowest note of the chord if it is in root position. Root position is when the chord is built up in thirds. Ex: C, E and G make up the C chord and the root of the chord "C" is also the base note. If this same C chord is mixed around so that G is the lowest note then higher in order is C and then E, then G would be the base note of the chord.
You add an extra note into the original minor chord. An A minor chord consists of the notes A - C - E. The Am7 chord consists of A - C - E - G
The name of this chord is C major.
The key notes in a C minor chord are C, Eb, and G.
The notes of a C major chord on the guitar are C, E, and G.
c chord, d chord and the g chord