Uncle Wang from Shanghe New Village was going to work in the factory. When he left, he tied a sheep to the corner of his yard (rectangular and more than 2 meters long and wide) with a 2-meter-long rope. Please calculate how big the range of activities of this sheep is?
上河新村的王伯伯准备去厂里办事，走时用一根2米长的绳子，把一只羊拴在了自家院子里(长方形且长宽都大于2米)的墙角．请你算一算这只羊的活动范围有多大？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * 4 * (1/4)</gadget>
<output>3.14</output>

<result>3.14</result>