Cut the largest circle out of a rectangle with a length of 8 cm and a width of 6 cm. What is the radius of this circle in cm?
在一个长为8厘米、宽为6厘米的长方形中剪一个最大的圆，这个圆的半径是多少厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<result>3</result>