Concrete columns

How much concrete is needed to pour 8 concrete columns with a square base: a = 38 cm, the height of the columns being 6.2 m? Each column has a cylindrical cavity with a diameter of 15 cm.

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You need to know the following knowledge to solve this word math problem:

algebra

rearrange variables

solid geometry

cylinder
cuboid
volume of a solid
prism

planimetry

circle
area of a shape
square

Units of physical quantities

volume
area

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