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The planet Mercury has a diameter of 4879.4 kilometers. Nonsense is the measure of its diameter in mm. But it is 4879400000 millimeters (4.8794 x 109 mm or about 5 billion mm).
The British one penny is 20.32 mm in diameter with a thickness of 1.52 mm of bronze (if made between 1971 and 1992) and 1.65 mm copper-plated steel (if minted after 1992).The one penny weighs 3.5625 grams. The two pence is 25.9 mm in diameter and if minted before 1992 has a thickness of 1.85 mm (bronze), and if minted after 1992 has a thickness of 2.03 mm (copper-plated steel) and weighs 7.125 grams. The 5 pence is 18 mm in diameter and has a thickness of 1.7 mm or 1.89 mm and weighs 3.25 grams. The ten pence has a diameter of 24.5 mm with a thickness of either 1.85 mm or 2.05 mm and a weight of 6.5 grams. The twenty pence has a diameter of 21.4 mm and a thickness of 1.7 mm. The twenty pence weighs 5 grams. The 25 pence has a diameter of 38.61 mm, a thickness of 2.89 mm, and weighs 28.28 grams. The 50 pence has a diameter of 27.3 mm, a thickness of 1.78 mm, and weighs 8 grams. The one pound coin has a diameter of 22.5 mm, a thickness of 3.15 mm, and weighs 9.5 grams. The two pound coin has a diameter of 28.4 mm, a thickness of 2.5 mm, and weighs 12 grams. The five pound coin has a diameter of 38.61 mm, a thickness of 2.89 mm, and weighs 28.28 grams.
The circumference of a circle that is 16 mm in diameter is 50.27 mm
The circumference of a circle with a diameter of 13 mm is: 40.84 mm
and what does the 6 mm refer to? The diameter, presumably.