The perimeter of a square piece of paper is 16 decimeters, cut it into the largest circle, what is the area of the cut part in square centimeters?
一张正方形纸的周长是16分米，把它剪成一个最大的圆，剪去部分的面积是多少平方厘米．
<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">16 * (5/2) * 16 * (5/2)</gadget>
<output>1_600</output>

<gadget id="calculator">10 / 4 / 2</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">16 * (5/4)</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<gadget id="calculator">1_600 - 1_256</gadget>
<output>344</output>

<result>344</result>