Draw the largest circle in a square with an area of 36 square centimeters. What is the area of this circle in square centimeters?
在一个面积为36平方厘米的正方形内画一个最大的圆，这个圆的面积是多少平方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>