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The augmented triad does not appear in any major or natural minor scales.
The note "A"
A c# e
There is no such thing as B major. There is B minor and B flat major. The subdominant triad of B minor ( I'm pretty sure) is E minor.
In a major key, the triad built on the 7th scale degree is diminished. Using C major as an example, the triad on the 7th is B D F. B to D is a minor 3rd, as is D to F, so B to F is a diminished 5th.
The augmented triad does not appear in any major or natural minor scales.
The subdominant triad of Eb major is the Ab major triad.
C major triad : C - E - GG major triad : G - B - DD major triad : D - F# - AA major triad: A - C# - EE major triad : E - G# - BB major triad : B - D# - FC# major triad: C# - E# - G#F# major triad : F# - A# - C#Cb major triad : Cb - Eb - GGb major triad : Gb - Bb - DbDb major triad : Db - F - AbAb major triad : Ab - C - EbEb major triad : Eb - G - BbBb major triad : Bb - D - FF major triad : F - A - CA natural minor triad : A - C - EE natural minor triad : E - G - BB natural minor triad : B - D - F#F# natural minor triad : F# - A - C#C# natural minor triad : C# - E - G#A# natural minor triad : A# - C# - EG# natural minor triad : G# - B - D#D# natural minor triad : D# - F# - A#Eb natural minor triad : Eb - Gb - BbAb natural minor triad : Ab - C -EbBb natural minor triad : Bb - Db - FD natural minor triad : D - F - AG natural minor triad : G - Bb - DC natural minor triad : C - Eb - GF natural minor triad : F - Ab - C
The note G would complete the major triad C - E - G.
A c# e
The note "A"
Subdominant. Its triad is major.
b major
There is no such thing as B major. There is B minor and B flat major. The subdominant triad of B minor ( I'm pretty sure) is E minor.
The tonic of F major is F major.
An augmented triad is made of two major thirds, and is the only triad not found in a diatonic scale. For example, the chord could be made of C natural, E natural, and G sharp.
The dominant is the 5th, which in the key of A-flat major is E-flat. Then an E-flat major triad contains the notes E-flat, G, and B-flat.