decimeters
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Actually, 238 cm = 23.8 dm so 238 cm is more precise.
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19.2cm is more precise
12 mm is the most precise.
(24 cm)² = 576 sq cm, the area of a square with sides 24 cm 24 cm² = an area of 24 sq cm
These numbers are precise, as they are all close together. If any one of these are accurate, then this group of numbers can be considered precise and accurate.