Xiao Ming has two square wooden boards with an area difference of 800 square centimeters. He processes the two boards into two largest circles respectively. How many square centimeters does the area of the two circles differ?
小明有两块方形木板，面积相差800平方厘米，他把这两块木板分别加工成两个最大的圆，则这两个圆的面积相差多少平方厘米？
<gadget id="calculator">3.14 / 4</gadget>
<output>0.785</output>

<gadget id="calculator">0.785 * 800</gadget>
<output>628</output>

<result>628</result>