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"
Diameter of an Australian penny (no longer currency) is 1 and 3/16".
0.75"
Well, honey, a penny has a diameter of about 0.75 inches, so we can calculate the surface area using the formula for the area of a circle. The surface area of a penny is approximately 0.441 square inches. So, there you have it, the glamorous surface area of a humble little penny.
Circumference: 0.75 times pi = 2.356 inches rounded to three decimal places
The US one-cent coin is 0.750 inches in diameter and 0.061 inches thick,for a volume of 0.027 cubic inches.The UK plated-steel penny (one new pence) is 20.32 mm in diameter and 1.65 mm thick, for a volume of 0.535 cm3 or about 0.033 cubic inches.(see related question)
Diameter of an Australian penny (no longer currency) is 1 and 3/16".
0.75"
The size of the penny is very important. The weight of it is 2.500 grams exactly. The diameter is 0.750 inches or 19.05 mm or 1.905 centimeters.
A PENNY coin has a Diameter of exactly 1&3/16ths Inches which is same as 1.1875 inch. The foregoing applies to a British penny. A US 1 cent piece is 19.05mm (.75 inches) in diameter, 1.55mm thick, and weighs 2.5 grams
Well, honey, a penny has a diameter of about 0.75 inches, so we can calculate the surface area using the formula for the area of a circle. The surface area of a penny is approximately 0.441 square inches. So, there you have it, the glamorous surface area of a humble little penny.
.75 inches or 19 Millimeters is the diameter so the radius is .375 inches or 9.5 Millimeters.
Circumference: 0.75 times pi = 2.356 inches rounded to three decimal places
The US one-cent coin is 0.750 inches in diameter and 0.061 inches thick,for a volume of 0.027 cubic inches.The UK plated-steel penny (one new pence) is 20.32 mm in diameter and 1.65 mm thick, for a volume of 0.535 cm3 or about 0.033 cubic inches.(see related question)
The diameter of a penny is approximately 0.75 inches (19.05 millimeters). To convert this measurement to kilometers, we need to first convert inches to meters by multiplying by 0.0254 (since 1 inch is equal to 0.0254 meters). This gives us a diameter of approximately 0.0004826 meters. Finally, to convert meters to kilometers, we divide by 1000, resulting in a diameter of approximately 0.0000004826 kilometers.
The diameter of a penny is 0.750-inches. A United States penny is made of copper-plated zinc. Coins that are worn, but still recognizable and coins that are chipped or mutilated are melted and reused.
The diameter of a US penny is 0.01905 metres
The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi