In the middle of a vegetable field with a length of 12m and a width of 11m, a sprinkler capable of rotating 360° is installed, and the longest distance can spray 5m. What is the minimum area that cannot be irrigated?
在一块长为12m，宽为11m的菜地中间装有一个能够360°旋转的喷水器，最远能喷5m．不能喷灌的面积最少有多少平方米？
<gadget id="calculator">12 * 11</gadget>
<output>132</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">132 - 78.5</gadget>
<output>53.5</output>

<result>53.5</result>