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How to do 8 questions on page 14 of the second volume of the mathematics textbook for the sixth grade of primary school?
Question 14: rotate with the length as the axis, the volume is10 *10 * 3.14 * 20 = 6280 cubic centimeters, rotate with the width as the axis, and the volume is 20 * 20 * 3.1.
Question 15: The largest volume is the first rectangle, with a base perimeter of 18 and a height of 2, and the smallest volume is also the first rectangle, with a base perimeter of 2 and a height of 18.