Not very big.
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30 mm is only 3 cm
A length of 1.35 metres.
300 000 mm2 or 3 000 cm2 or 30 dm2 or 0.3 m2
30 mm = 0.098425 '
As 25.4 mm equal 1 in exactly, divide 30 mm by 25.4 mm/in to convert it to inches. → 30 mm = 30 ÷ 25.4 in ≈ 1.18 in