Draw the largest square in a circle. It is known that the area of the square is 40 square centimeters. What is the area of the circle?
在一个圆里画一个最大的正方形，已知正方形的面积是40平方厘米，圆的面积是多少？
<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<result>62.8</result>