How many square centimeters of plastic board should be used to make a small cylindrical garbage box with a bottom diameter of 8cm and a height of 30cm? (with cover)
做一个底面直径8cm、高30cm的圆柱形小垃圾盒，至少要用多少平方厘米的塑料板？(有盖子)
<gadget id="calculator">3.14 * 8 * 30</gadget>
<output>753.6</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<gadget id="calculator">753.6 + 100.48</gadget>
<output>854.08</output>

<result>854.08</result>