The radius of a circular piece of paper is 3 cm, and the side length of a square piece of paper is 4 cm. The overlapping parts of the two pieces of paper are placed on the table, and the area covered by the table is 38 square centimeters. Question: What is the area of the overlapped part of the two pieces of paper?
一张圆形纸片的半径是3厘米，一张正方形纸片上的边长是4厘米．两张纸片重叠一部分放在桌面上，覆盖桌面的面积为38平方厘米．问：两张纸片重合部分的面积是多少？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

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

<gadget id="calculator">16 - 38</gadget>
<output>-22</output>

<gadget id="calculator">28.26 + (-22)</gadget>
<output>6.26</output>

<result>6.26</result>