Draw the largest circle on a rectangular piece of paper with a length of 6 cm and a width of 4 cm. What is the radius of the circle in cm?
在长6厘米，宽4厘米的长方形纸上画一个最大的圆，圆的半径是多少厘米
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>