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2-c
P=π12²
P=144π
2. P=64π
πr²=64π
r²=64
r=8
Ob=2πr
Ob=16π
P=12²*π
P=144π
odp. D
2. P=64π
πr²=64π
r²=64
r=√64
r=8
zatem:
Obw=2πr
Obw=16π
odp. B