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⅓ . r1² . t1 : ⅓ . r2² . t2
angka ⅓ di ruas kanan dan kiri dihapus karena nilainya sama
r1² . t1 : r2² . t2
2² . t1 : 3² . t2
4t1 = 9t2
maka perbndgan t1 : t2
= 4 : 9