There are 2.45 centimeters in an inch, which means that 3 inches is equal to 7.62 centimeters.
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It is 3 cm. Exactly as in the question.
6.5
Density = grams/cm^3 (cc) 3 cm^3 = 27 cm^3 Density = 12 grams/27 cm^3 = 0.4 grams/cm^3 ----------------------------
There are 3 cm in 3 centimetres!