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V = 4.710
t = 15 cm
ditanya r ?
maka :
V = π x t x r²
4.710 = 3,14 x 15 x r²
4.710 = 47,1 x r²
r² = 4710 / 47,1
r = √100
r = 10 cm
jadi jari-jari tabung adalah 10 cm
= √ 4710 / 3,14 x 15
= √4710 / 47,1
= √100
= 10 cm