Draw the largest circle in a rectangle with a length of 6 meters and a width of 4 meters. What is the radius of this circle in meters?
在一个长6米，宽4米的长方形中画一个最大的圆，此圆的半径是多少米
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>