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r1 : r2 = 4:1
v1 : v2 = 1:1
= 1/3 x 3,14 x 4 x 4 x 1 ÷ 1/3 x 3,14 x 1 x 1 x 4
= 4 x 4 x 1 ÷ 1 x1 x 4
= 16 ÷ 4
= 4 : 1