×AEbAC×
Fig. 1 · Adim · open

guitar chord

Adim

A1C♭3E♭♭5

Two minor thirds stacked. The fifth is diminished, so it cannot be dropped without losing the chord.

on ukuleleon pianothe scale

Every fingering that fits a hand

Fig. 2

x0121x

open

Fig. 3

x07545

hard

Fig. 4

50754x

hard

Fig. 5

x0754x

easy

4
Fig. 6

xx7545

hard

What is true of it

Adim is A, C and E♭ — 1, b3 and b5 counted from A.

The easiest of the 5 fingerings below is x0121x: 3 fingers, held at the 1st fret.

1 of them use open strings, which is what makes a shape quiet to change to.

2 strings stay silent.

Where its notes are on the neck

EADGBE1234567891011121b3b51b3b51b51b31b3b5b3b511b3b5
Fig. 7 — first 12 frets

The brass dots are A, the root. Everything else is a chord tone with its degree printed in it.

With a different note underneath

first inversion

Adim/C

x3121x

4
second inversion

Adim/E♭

x6754x

An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.

A in other shapes

AmajorAmminorAaugaugmentedA5power chordAsus2suspended secondAsus4suspended fourth

CdimC♯dimD♭dimDdimD♯dimE♭dimEdimFdimall 374