A circle with a radius of 8 cm has a square inside and a square outside the circle. The four vertices of the square inside the circle are on the circumference, and the four sides of the square outside the circle have only one point of contact with the circle. Then the area of the square outside the circle is larger than the area of the square inside the circle by how many square centimeters.
有一半径为8厘米的圆，圆内和圆外各有一个正方形．圆内正方形的四个顶点在圆周上，圆外正方形的四条边与圆都只有一个接触点，那么圆外正方形的面积比圆内正方形的面积大多少平方厘米．
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">16 * 16</gadget>
<output>256</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">16 * 8</gadget>
<output>128</output>

<gadget id="calculator">256 - 128</gadget>
<output>128</output>

<result>128</result>