Cut a largest square out of a circle with a diameter of 2 meters, what is the area of the square?
在直径是2米的圆中剪一个最大的正方形，正方形的面积是多少．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<result>2</result>