The lateral expansion of a cylinder is a square with a side length of 12.56 cm. What is the area of the base of this cylinder in square centimeters?
圆柱的侧面展开是一个边长为12.56厘米的正方形，这个圆柱的底面积为多少平方厘米．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>