D major chord for piano (including D/F# and D/A inversions) presented by keyboard diagrams.
Explanation: The regular D chord is a triad, meaning that it consists of three notes. On the picture of the keyboard, you can see the three notes of the D chord marked in red color.
Theory: The D major chord is constructed with a root, a major third and a perfect fifth.
Fingerings: Little finger, middle finger, thumb (left hand); thumb, middle finger, little finger (right hand).
Explanation: D/F# is a D major chord with F# as the bass note and D/A is a D major chord with A as the bass note.