Answer:
Historically, buttresses have been used to strengthen large walls or buildings such as churches. Flying buttresses consist of an inclined beam carried on a half arch that projects from the walls of a structure to a pier which supports the weight and horizontal thrust of a roof, dome or vault.
Explanation:
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The A minor chord i7 is the A min 7 chord, and contains the notes A, C, E, and G. This tonic 7th chords root / starting note is the 1st note (or scale degree) of the A natural minor scale. The roman numeral for number 1 is 'i', and is used to indicate this is the 1st chord in the scale.