A millimetre. (1/10 of a centimetre)
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decigram
One inch is 25.4 mm, you do the math.
it stands for milligrams
grams or gallon
Oh, dude, you're hitting me with some math here. So, the circumference of a circle is calculated by multiplying the diameter by pi (π). Since the diameter of a circle is twice the radius, and you've given me the radius (40 mm), I can tell you that the circumference of a 40 mm circle would be approximately 251.2 mm. It's like math, but with a side of sarcasm.