Cut the largest circle out of a rectangle with a length of 5 cm and a width of 4 cm, what is the radius of the circle in cm
在一张长5厘米，宽4厘米的长方形中剪一个最大的圆，圆的半径是多少厘米
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>