A major scale

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A major notes: A B C# D E F# G#

3-notes chords built on A major scale:

1. A Major: A C# E
2. B Minor: B D F#
3. C# Minor: C# E G#
4. D Major: D F# A
5. E Major: E G# B
6. F# Minor: F# A C#
7. G# Diminished: G# B D

4-notes chords built on A major scale:

1. A Major 7: A C# E G#
2. B Minor 7: B D F# A
3. C# Minor 7: C# E G# B
4. D Major 7: D F# A C#
5. E Dominant 7: E G# B D
6. F# Minor 7: F# A C# E
7. G# Half Diminished 7: G# B D F#