Which triad quality is built on the seventh scale degree?

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Multiple Choice

Which triad quality is built on the seventh scale degree?

When you build a triad from a given scale degree, you stack two more notes by thirds using the key’s diatonic notes. On the seventh degree, the triad uses the root, a minor third above (the third), and a diminished fifth above (the fifth). In a C major example, that’s B–D–F. The interval from B to D is a minor third, and from B to F is a diminished fifth, which together form a diminished triad. This is different from a major triad (root–major third–perfect fifth) or a minor triad (root–minor third–perfect fifth) or an augmented triad (root–major third–augmented fifth). So the triad built on the seventh scale degree is diminished.

When you build a triad from a given scale degree, you stack two more notes by thirds using the key’s diatonic notes. On the seventh degree, the triad uses the root, a minor third above (the third), and a diminished fifth above (the fifth). In a C major example, that’s B–D–F. The interval from B to D is a minor third, and from B to F is a diminished fifth, which together form a diminished triad. This is different from a major triad (root–major third–perfect fifth) or a minor triad (root–minor third–perfect fifth) or an augmented triad (root–major third–augmented fifth). So the triad built on the seventh scale degree is diminished.

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