Draw the largest circle in a square with a side length of 2 cm. What is the area of the circle in the area of the square?
在一个边长为2cm的正方形中画出一个最大的圆，圆的面积占正方形面积的多少．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">3.14 * (1/4) * 1</gadget>
<output>0.785</output>

<result>0.785</result>