The A Diminished chord contains A, C, E♭. Formula: 1–♭3–♭5.
The a diminished triad uses a root, minor third and diminished fifth.
Preserve the written note spelling shown for this chord.
Choose a position to keep the written notes, sounding keys, bass note, playback and print reference synchronized.
Adim uses 1–♭3–♭5: A–C–E♭.
The a diminished triad uses a root, minor third and diminished fifth.
Compared with A minor, lower the fifth by one semitone.
The chord tones stay the same while the lowest chord tone changes.
| Position | Symbol | Notes, low to high | Bass |
|---|---|---|---|
| Root position, current selection | Adim | A3–C4–E♭4 | A3 |
| First inversion | Adim/C | C4–E♭4–A4 | C4 |
| Second inversion | Adim/E♭ | E♭4–A4–C5 | E♭4 |
No independent fingering dataset is authorized for N2B.
Use the written notes, keyboard positions and playback without treating the diagram as a required hand shape.
Read left- and right-hand finger numbersOpen Music Theory
Supports: diminished = minor third + diminished fifth; augmented = major third + augmented fifth; triad spelling principles
Scope limit: Theory and spelling cross-check only; no source prose, artwork, fingering or PDF is copied.
Checked 2026-09-12 · N2B-OMT-TRIADSPianoChord.org
Supports: competitor family coverage; cross-check examples only
Scope limit: Theory and spelling cross-check only; no source prose, artwork, fingering or PDF is copied.
Checked 2026-09-12 · N2B-PC-COLLECTIONA, C, E♭.
1–♭3–♭5.
No. The root stays the same; the lowest chord tone changes.
Select the three pitch classes that make Adim, then check your answer.
This one-octave exercise checks pitch classes. Order and octave do not affect the result; fingering and live performance are not assessed.
One octave, C through B. Select a key again to remove it.
Chord tones: A–C–E♭ · Formula: 1, ♭3, ♭5
Dots mark the notes to play. C4 is middle C. Numbers identify octaves, not fingers.