In a rectangle with a length of 7 cm and a width of 6 cm, draw the largest circle, what is its area in square centimeters?
在一个长为7厘米、宽为6厘米的长方形里面，画一个最大的圆，它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>