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To determine this, it's best to first convert the lengths to the same unit, either

  • 3.4 cm, 3.0 cm; OR
  • 34 mm, 30 mm

You can then clearly see that 3.4 cm (which is 34 mm) is the longer of the two measurements, i.e. 3.4 cm > 30 mm

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12y ago

What else can I help you with?