The radius of a semicircle is 8 cm, what is the area of the semicircle in square centimeters?
一个半圆的半径是8厘米，这个半圆面积的是多少平方厘米．
<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>