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⇔ πr₁² : πr₂²
⇔ π x (9 cm)² : π x (15 cm)²
⇔ π x 81 cm² : π x 225 cm²
⇔ 81 : 225
⇔ 9 : 25
r₁² : r₂² =
9² : 15² =
81 : 225 =
9 : 25 (D)