Draw the largest semicircle on a piece of rectangular paper with a length of 6cm and a width of 4cm. What is the radius of the semicircle in cm?
在一张长6cm、宽4cm的长方形纸上画一个最大的半圆，半圆的半径是多少cm
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>