Construct the largest circle in a square with an area of 50 square centimeters, what is the area of this circle in square centimeters?
在面积是50平方分米的正方形内做一个最大的圆，那么，这个圆的面积是多少平方厘米．
<gadget id="calculator">3.14 * 12.5</gadget>
<output>39.25</output>

<result>39.25</result>