If a circle of paper with a diameter of 2 cm is subtracted from a circle of paper with a radius of 2 cm, what is the remaining area?
在半径为2厘米的圆形纸中减去一个直径为2厘米的圆形纸片，剩下的面积为多少？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

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

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

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

<gadget id="calculator">12.56 - 3.14</gadget>
<output>9.42</output>

<result>9.42</result>