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No 4. B.176 cm
No 5. keknya C.66 cm

4. k=22/7×56=176 cm (b)
5. 1/2×22/7×14×14=308 cm
22/7×7×7=154
308-154=154
6. k=22/7×35=110 cm
110×1000=110.000
110.000cm=1,1 km a

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