After cutting a circular glass with a circumference of 18.84dm from a glass with a length of 8dm and a width of 6dm, how many square decimeters of glass are left?
从一个长8dm，宽6dm的玻璃上切割下一个周长为18.84dm的圆形玻璃后，余下的玻璃是多少平方分米？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">18.84 / 3.14 / 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>

<gadget id="calculator">48 - 28.26</gadget>
<output>19.74</output>

<result>19.74</result>