How do you inscribe a square in a circle?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

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