An ordinary pencil is one example.
A cent (penny) is circular so the "greatest distance" is simply its diameter. Since 1858, all US cents have had a diameter of 19.05 mm.
d = 2r = 12 mm
216 mm3
It is a diameter of 39.37 cm.
An ordinary pencil is one example.
6mm
3.85
A cent (penny) is circular so the "greatest distance" is simply its diameter. Since 1858, all US cents have had a diameter of 19.05 mm.
8mm
d = 2r = 12 mm
6mm obvious
6mm is a quarter inch.
Area = pi*32 = 28.274 square mm to 3 d.p.
216 mm3
they shoot small plastic BB's ranging from .18 to .26 grams and are 6mm in diameter.
The two measurements you give are not related, essentially. The MM measurement could be the diameter of a brilliant cut diamond, or one measurement of another shape. The carat weight you give is a weight measurement of gemstones.