Cut the largest circle out of a square cardboard with a circumference of 4 cm, what is the area of the remaining part in square centimeters?
在一张周长为4厘米的正方形硬纸板上，剪一个最大的圆，剩下部分的面积是多少平方厘米？
<gadget id="calculator">4 / 4</gadget>
<output>1</output>

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

<gadget id="calculator">4 / 4 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) ** 2</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 - 0.785</gadget>
<output>0.215</output>

<result>0.215</result>