Cut a largest square from a circle with a diameter of 8 decimeters, what is the area of this square?
在一个直径8分米的圆中截取一个最大的正方形，这个正方形的面积是多少平方分米？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">4 * 2 * 4</gadget>
<output>32</output>

<result>32</result>