To play the Adim chord, place the index finger on the 2nd fret of the top g-string, middle finger on the 3rd fret of the C-string, little finger on the 5th fret of the E-string, and ring finger on the 3rd fret of the bottom A-string.
The Adim chord contains the notes A-C-Eb.
To build a Adim chord, take the diminished triad formula (1-b3-b5) and apply it to the A major scale (A, B, C#, D, E, F#, G#).
Identify the first, third, and fifth scale degrees in a A major scale which are A-C#-E.
Lower the third and fifth scale degrees a half step in accordance with the diminished triad formula, which results in the notes A-C-Eb for the Adim chord.
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