A sheep is tied in a rectangular sheep pen with a length of 4 meters and a width of 3 meters. There is a gap at B, and the sheep can come in and out freely. The length of the tether is 9 meters. Then the area where the sheep can reach is about How many square meters. (π is 3.14, and the result is rounded to two decimal places)
一只羊被栓在一个长为4米，宽为3米的长方形羊圈内，在B处有一个缺口，羊可以自由出入，栓绳长9米，那么羊能够到达的地方的面积约为多少平方米．(π取3.14，结果保留两位小数)
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(3/4) * 3.14 * 16</gadget>
<output>37.68</output>

<gadget id="calculator">9 - 5 - 3</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 1 * (1/4)</gadget>
<output>0.785</output>

<gadget id="calculator">12 + 37.68 + 0.785</gadget>
<output>50.465</output>

<result>50.465</result>