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d = 20 cm
r = 10 cm
r : t = 2 : 3
10 : t = 2 : 3
t = 3/2 x 10
t = 3 x 5
t = 15 cm
Ditanya : v
v = luas alas x tinggi
v = 3.14 x 10 x 10 x 15
v = 4710 (B)
jadi jawabannya B