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7,2 = 9 x 10 pangkat 9 x 40 x 80/rkuadrat
rkuadrat = 9 x 10 pangkat 9 x 40 x 80/72 x 10 pangkat -1
r kuadrat = 4 x 10 pangkat 12
r= 2 x 10 pangkat 6
kalau bisa coba hitungan nya diulang lagi ya