A cylinder with a base diameter and a height of 6 cm is cut along the base diameter into two half cylinders, what is the surface area of each half cylinder?
沿着底面直径将底面直径和高都是6厘米的圆柱切成两个半圆柱，每个半圆柱的表面积是多少．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 6 * 3</gadget>
<output>56.52</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">56.52 + 36 + 28.26</gadget>
<output>120.78</output>

<result>120.78</result>