A cylinder has a base diameter of 12 decimeters and a height of 4 decimeters. What is the surface area of this cylinder.
一个圆柱的底面直径12分米，高4分米．这个圆柱的表面积是多少．
<gadget id="calculator">3.14 * 12 * 4</gadget>
<output>150.72</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36 * 2</gadget>
<output>226.08</output>

<gadget id="calculator">150.72 + 226.08</gadget>
<output>376.8</output>

<result>376.8</result>