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An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

  • Math -

    Cut the tube. It is a cylinder 82 in long, with a cross-section a circle of radius 1

    The volume of the cylinder is thus pi r^2 * h = 82pi

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