Saw a round log (r=3, h=8, unit: cm) in half, find the surface area of the half-cylindrical log. (unit: cm)
把一根圆木(r=3，h=8单位：厘米)锯成一半，求这个半圆柱木料的表面积．(单位：厘米)
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">3.14 * 3 * 8</gadget>
<output>75.36</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">28.26 + 75.36 + 48</gadget>
<output>151.62</output>

<result>151.62</result>