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616 : 1386 = (r1)² : (r2)²
616 .(r2)² = 1386 (r1)²
(r2)² = 1386/616 .(r1)²
(r2)² = 2,25 (r1)²
r2 = √(2,25 .r1²)
r2 = 1,5 . r1
jadi, perubahan panjang jari-jari adalah 1,5 kali