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40.000 = 1/3 × ( 40×50÷2) × t
40.000 = 1/3 × 1000 × t
40.000 = 1.000/3 × t
t = 40.000 ÷ 1.000/3
t = 40.000 × 3/1.000
t = 120.000/1.000
t = 120 cm
2. 1m = 1 × 100 = 100 cm
V = 3,14 × 35(2) × 100
V = 3,14 × 1.225 × 100
V = 3.846,5 × 100
V = 384.650 cm
3. V = phi × r2 × t
9.240 = 3,14 × r2 × 30
9.240 = 94,2 × r2
r2 = 9.240 ÷ 94,2
r2 = 98
D = 98 × 98 = 9.604