It is known that r=3 decimeters and h=12 decimeters. Find the surface area of the cylinder.
已知r=3分米，h=12分米．求圆柱表面积．
<gadget id="calculator">2 * 3.14 * 3 * 12</gadget>
<output>226.08</output>

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

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<gadget id="calculator">226.08 + 56.52</gadget>
<output>282.6</output>

<result>282.6</result>