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D=8m
volumenya = 22/7 x 4 x4 x 14
= 704 m2
K=25 1/7 m
π=22/7
K=2πr
r=K:2π
r=25 1/7 : 2. 22/7
r=176/7 × 7/44
r=176/44
r=4 m
V=πr²t
V=22/7 . 4². 14
V=22. 32
V=704 m³