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30 mm is only 3 cm
Male athlete: 62 x 2.54 = 157.48 cm 157.48 cm x 29 cm^2 = 4,566.92 cm^3 Female athlete: 56 x 2.54 = 142.24 cm 142.24 cm x 22 cm^2 = 3,129.28 cm^3 Difference: 1,437.64
30 cm (30 centimters) is 3/100 of a meter, or 300 millimeters, about equal to a foot in length. (30 cm = 0.984 ft)
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It is 3 cm. Exactly as in the question.