Construct the largest square in the circle. It is known that the area of the square is 40 square centimeters. What is the area of the circle in square centimeters?
在圆中做一个最大的正方形，已知这个正方形的面积是40平方厘米，那么这个圆形的面积是多少平方厘米？
<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<result>62.8</result>