A piece of rectangular cardboard is 12 cm long and 8 cm wide. Cut a largest semicircle from this rectangular cardboard. What is the radius of this semicircle in centimeters?
一张长方形纸板长12厘米，宽8厘米，在这张长方形纸板剪一个最大的半圆，这个半圆的半径是多少厘米
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>