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What is the average radius of cylinders

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A research group has perfected a new way of growing very small, uniform, cylindrical Columns of diamond. While they are writing up their results for publication, a graduate student spills coffee all over his laboratory notebook and is no longer able to read the measured radius of his columns for one sample. Additionally, he has foolishly thrown that sample away. After a fit of rage, he remembers a ridiculous problem he was forced to do on a general chemistry exam and sits down to calculate the radius of his cylinders.

Surface area of each cylinder can be approximated by the sum of a rectangle plus

568_cylinders.png

What is the average radius of cylinders in this sample (in pm)?

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Reference no: EM13293951

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