In a circle with a diameter of 8 cm, cut a largest square, what is the area of this square in cm**2.
在一个直径为8cm的圆内，剪一个最大的正方形，此正方形的面积是多少cm**2．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">8 * 2 * 2</gadget>
<output>32</output>

<result>32</result>