A cylinder has a lateral area of 113.04 square meters and a height of 9 meters. What is the area of the base of this cylinder.
一个圆柱的侧面积是113.04平方米，高9米．这个圆柱的底面积是多少．
<gadget id="calculator">113.04 / 9 / 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>