10 mm = 1 cm
20 mm = 2 cm
30 mm = 3 cm
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etc.
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30mm
3.4 cm
3.4 centimeters! oh yah! im right!
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.
In terms of length, 30mm is greater than 3cm. This is because 1cm is equal to 10mm. Therefore, 3cm is equivalent to 30mm.