Using a piece of square paper with a side length of 40 cm, cut out the largest circle, what is the area of the remaining part?
用一张边长40厘米的正方形纸，剪出一个最大的圆，剩下的部分的面积是多少？
<gadget id="calculator">1_600 - 1_256</gadget>
<output>344</output>

<result>344</result>