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In terms of length, 30mm is greater than 3cm. This is because 1cm is equal to 10mm. Therefore, 3cm is equivalent to 30mm.
2.5 cm 0.025 meter 0.98425 inch (rounded)
20 mm, which is equal to 2 cm.
Well, honey, if we're talking about a square with sides that are all 3cm long, then each side is, surprise surprise, 3cm in length. It's a square, not a triangle – all sides are equal. So, grab a ruler, measure it out, and you'll see that each side is indeed 3cm.