Cut the largest semicircle out of a rectangular paper with a length of 6 decimeters and a width of 2 decimeters. What is the area of this semicircle in square decimeters?
在一个长6分米、宽2分米的长方形纸上剪下一个最大的半圆，这个半圆的面积是多少平方分米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<result>6.28</result>