To make a cylindrical tea box with a bottom radius of 6 cm and a height of 18 cm, the overlap between the lid and the box body is 2 cm. To make such a tea box, at least how many square centimeters of cardboard is needed.
要制作一个底面半径6厘米，高18厘米的圆柱形茶叶筒，盖子与盒身重合处有2厘米，制作一个这样的茶叶盒，至少要多少平方厘米纸板．
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 6 * 2 * 20</gadget>
<output>753.6</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">753.6 + 226.08</gadget>
<output>979.68</output>

<result>979.68</result>