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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.
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"