Cut out the largest semicircle on a piece of rectangular paper with a length of 8 cm and a width of 3 cm. What is the area of the semicircle in square centimeters?
在一张长是8厘米，宽是3厘米的长方形纸上剪下一个最大的半圆，半圆形的面积是多少平方厘米？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">3.14 * (9/2)</gadget>
<output>14.13</output>

<result>14.13</result>