If a cube with a side length of 20cm is cut into the largest cylinder, what is the lateral area of the cylinder?
把一块棱长20cm的正方体木块削成一个最大的圆柱，这个圆柱的侧面积是多少？
<gadget id="calculator">3.14 * 20 * 20</gadget>
<output>1_256</output>

<result>1_256</result>