In a square with a side length of 12 cm, draw the largest circle, what is the area of this circle?
在一个边长是12cm的正方形中，画一个最大的圆，这个圆的面积是多少．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<result>113.04</result>