Convert 345 cm2 to the equivalent number of square feet (ft2)

Answer is: 345 cm² is 0,37 ft².
1 cm² = 0,00107 ft².
345 cm² = 345·0,00107 ft² = 0,37 ft².
The square foot (plural square feet) is an imperial unit and U.S. customary unit, used in the United States and partially in Canada, Ghana, United Kingdom, Hong Kong, India, Malaysia, Nepal, Pakistan and Singapore.

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And a) oxygen i believe