C6 chord for piano with the piano diagram.
The C6 or C 6th Chord is a tetrad, meaning it contains four notes. Also the shaded area in the piano diagram has four notes shaded is the chord.
The C 6th chord consist of root, major third(3rd), major fifth(5th) and major sixth(6)
Left hand: 5-3-2-1 Right Hand: 1-2-3-4