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10 cm is greater.
345cm. 3400mm /(10cm/mm)=340cm.
1 decimeter is 10cm, so 4 is 40cm, greater than for 4cm
The radius is half the diameter. Therefore, 770 divided by 2 equals 385mm
10 cm is greater than 38.5 mm because 10 cm = 100 mm and 38.5 millimeters = 3.85 centimeters.