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Approximately 10.23 cm3.
12 cm2
7 mm is about a quarter inch and 3 mm about an eighth of an inch.
One half inch is half of one inch (½ inch) - approximately 1.27 cmThis should not be confused with one and a half inch which is 1½ inches - approx 3.8 cm
3 mm is about an eighth of an inch; 7 mm is a bit more than a quarter inch.