Draw the largest circle in a square with a side length of 10 cm, and then draw the largest square in the circle, find the area of the square.
在一个边长为10厘米的正方形里画一个最大的圆，然后在圆里画一个最大的正方形，求正方形面积．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<result>50</result>