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21 April, 12:42

What is the radius of thr brazilian coin that has a circumference of 84.78 mm? Explaim you work. Use 3.14 for pi

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  1. 21 April, 12:52
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    Hello there! Circumference is pi * diameter. Radius is ½ of the diameter. In order to find the diameter, all you have to do is divide the circumference by pi (3.14). 84.78/3.14 is 27. Now, divide that number by 2 to get 13.5. There. The radius of the Brazillian coin is 13.5 mm.
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