Cut the largest circle from a rectangle with a length of 7 cm and a width of 6 cm, what is the area of the cut part?
从一个长7厘米，宽6厘米的长方形中剪去一个最大的圆形，剪去部分的面积是多少．
<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>