Roll a piece of rectangular paper with a length of 12cm and a width of 6cm into a cylinder, and paste the two bottoms of the cylinder with circular paper. What is the minimum surface area of the cylinder in square centimeters? (π takes 3)
把一张长12cm，宽6cm的长方形纸卷成一个圆柱，并把这个圆柱的两底面用圆形纸片糊上，这个圆柱的表面积最小是多少平方厘米？(π取3)
<gadget id="calculator">6 / 3 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3 * 1 * 2</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<gadget id="calculator">6 + 72</gadget>
<output>78</output>

<result>78</result>