9.4cm
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To convert 9 cm 4 mm to a single unit, you need to first convert the millimeters to centimeters. There are 10 mm in 1 cm, so 4 mm is equal to 0.4 cm. Adding this to the original 9 cm gives us a total of 9.4 cm. Therefore, 9 cm 4 mm is equivalent to 9.4 cm.
9cm + 5cm + 9cm + 5cm = 28cm
4mm is smaller than 5mm
9cm
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