From a rectangle with a length of 18 cm and a width of 8 cm, cut out the largest semicircle, what is the area of the semicircle in square centimeters?
一张长18厘米，宽8厘米的长方形中，剪出一个最大的半圆，则这个半圆的面积是多少平方厘米．
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">64 / 2</gadget>
<output>32</output>

<gadget id="calculator">3.14 * 32</gadget>
<output>100.48</output>

<result>100.48</result>