Draw the largest circle in a rectangle with a length of 12 cm and a width of 8 cm. What is the radius of the circle in cm?
在长为12厘米，宽为8厘米的长方形内画一个最大的圆，圆的半径应该是多少厘米
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>