In terms of length, 30mm is greater than 3cm. This is because 1cm is equal to 10mm. Therefore, 3cm is equivalent to 30mm.
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It is: 30mm = 3cm
3cm = 30mm.
10mm = 1cm 30mm = 3cm.
The diameter of any circle is twice the radius. Since the radius of this circle is 15mm, the diameter is 15mm*2=30mm. 30mm is also 3cm.
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