The length of a rectangle is 4 cm, and the width is 3 cm. A cylinder can be formed by rotating one side of the rectangle for one revolution. What is the maximum volume?
一个长方形的长是4cm，宽3是cm，以其中一边为轴旋转一周可以形成一个圆柱体，其体积最大是多少．
<result>12_560</result>