150
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15 mm
1 inch = 25.4 millimeters, so 15 in = 15 x 25.4 mm = 381 mm
.015 mm = 15 µm
Well, honey, the radius of a circle is always half of the diameter. So if the diameter is 30 mm, the radius would be 15 mm. It's basic math, darling. Hope that clears things up for you!
Since both lengths are in different units, so first of all we have to make their units same. 1 cm is equivalent 10 mm. So, 15 cm = 15 x 10 mm = 150 mm. 150 mm is greater than 140 mm, so 140 mm is shorter.