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= 65 cm × 2
= 130 cm
tabung kedua
= 65 cm × 3
= 195 cm
perbandingan
tabung pertama : tabung kedua
130 : 195
2 : 3
gw ngertinya gitu doang, sorry kalo salah
= 2 π 65
= 130 π
LS 2 = d πt
= 3 π65
= 195 π
perbandingan = 130 π/195 π
= 2/3