If the lateral expansion of a cylinder is a square with a side length of 8πcm, what is the area of the base of the cylinder in square centimeters?
一个圆柱侧面展开是一个边长为8π厘米的正方形，这个圆柱的底面积是多少平方厘米．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<result>16</result>