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r1 = 14 cm
t = 20
r 2 = 7
t = 10
dit Banyak ember yg diperlukan
V. 1 = 2πr ( r + t )
V.1 = 2 x 22/7 x 14 ( 14 + 20 )
V.1 = 2 x 22 x 2 (34)
V.1 = 88 x 34
V.1 = 2992 cm³
V.2 = 2πr ( r + t )
V.2 = 2 x 22/7 x 7 (7 + 10 )
V.2 = 2 x 22 (17)
V.2 = 44 x 17
V.2 = 748 cm³
Banyak ember = V.1 / V.2
= 2992/748
= 4 ember