What note completes the major triad with the root A?
The note that completes the major triad with the root A is C#.
To complete a major triad with the root A, we need to add two more notes - a major third and a perfect fifth - above the root note.
In the case of A major, the major third interval above A is C#, and the perfect fifth interval above A is E. Therefore, the note that completes the A major triad is E.
To find the note that completes the major triad with the root A, we need to understand how major triads are constructed. A major triad consists of three notes: the root (A in this case), the major third, and the perfect fifth.
To find the major third above A, we count two whole steps or four half steps. Starting from A, we count up: A, A#, B. So, the major third above A is B.
Next, to find the perfect fifth above A, we count seven half steps from A: A, A#, B, C, C#, D, D#. The perfect fifth above A is D#.
Therefore, the note that completes the major triad with the root A is D#.