Roll a square with a side length of 62.8 cm into the largest cylinder, and assign a base to the cylinder. What is the area of the base in square centimeters?
把一个边长是62.8cm的正方形卷成一个最大的圆柱，给这个圆柱配个底面，这个底面的面积是多少平方厘米？
<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<result>1_256</result>