A cylindrical tin box with a bottom radius of 2 decimeters and a height of 5 decimeters, how many square meters of paper is required to paste a label on the side of the box?
一个圆柱形铁皮盒，底面半径是2分米，高5分米，在这个盒子的侧面帖上商标纸，需多少平方米的纸？
<gadget id="calculator">2 * 3.14 * 2 * 5</gadget>
<output>62.8</output>

<result>62.8</result>