A regular hexagonal foundation 4 in. deep is being poured for a hexagonal building. If the distance across the flats of the foundation is 21 ​ft, how many cubic yards of concrete are​ needed?   ​(Round the final answer to the nearest tenth as needed. Round all intermediate values to the nearest thousandth as​ needed.)

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A regular hexagonal foundation 4 in. deep is being poured for a hexagonal building. If the distance across the flats of the foundation is 21

​ft, how many cubic yards of concrete are​ needed?

 

​(Round the final answer to the nearest tenth as needed. Round all intermediate values to the nearest thousandth as​ needed.)

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