Cut a square piece of paper with a side length of 12 cm into a circle with the largest area. What is the area of this circle in square centimeters?
把一个边长是12厘米的正方形纸片，剪成一个面积最大的圆，这个圆的面积是多少平方厘米．
<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>