You would use millimetres.
A current US one-cent coin (penny) is 19.05 mm in diameter and 1.55 mm thick.This is about 0.442 cubic centimeters (441.8 mm3) or 4.42 x 10-7 cubic meters.The British penny (one new pence, steel) is 20.32 mm in diameter and 1.65 mm thick.This is about 0.535 cubic centimeters or 5.35 × 10-7 cubic meters.(see related question below)
If the Earth were the size of a penny, the Sun would be about the size of a large beach ball or around 1.4 meters (4.6 feet) in diameter in comparison. The Sun is much larger than the Earth, with a diameter about 109 times that of Earth.
The diameter of a penny (British decimal coin - 1p) is 20.3 millimetres. Therefore, other coins will also be measured in millimetres
Copper
The diameter of a US penny is 0.01905 metres
0.75"
There are several countries in which the minor currency unit is a penny - including the US where a cent is called a penny!The UK penny has a diameter of 20.3 mm.
A US copper penny is exactly 2 cm wide.
Circles have a diameter, not length. The diameter of a US cent is 19 mm.
A US one cent coin measures 19mm, or 1.9cm, in diameter.
this depends on which penny you are asking about.The US penny, the Australian penny, the British penny, Canadian penny and the Irish penny coin.Each one is a different size and weight.Diameter of an Australian penny (no longer currency) is 1 and 3/16".Diameter of an old British penny (no longer in use) was 1.25". Modern pennies are 20.03 mm, or about 4/5"Diameter of a U.S. cent (penny) - 0.75"
A US cent (penny) is 1.905 cm wide. A dime is 1.791 cm wide.The diameter of a U.S. penny is 19mm, the thickness is 1.55mm. The diameter of a dime is 17.9mm with a thickness of 1.35mm.
A UK one pence coin has a diameter of 20.32 millimetres. A two pence coin has a diameter of 25.9mm. A five pence has a diameter of 18mm. A ten pence has a diameter of 24.5mm. A twenty pence is heptagonal and has a diameter of 21.4mm. A fifty pence is heptagonal and has a diameter of 27.3mm. A one pound coin has a diameter of 22.5mm. A two pound coin has a diameter of 28.4mm.
The diameter of a US penny is 0.75inches. There are 256 pennies in a square foot
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.
You would use millimetres.