A piece of rectangular label paper with a length of 31.4 cm and a width of 15 cm fits the side column of a cylindrical tea pot with a height of 15 cm. How many square centimeters of cardboard is needed to make such a tea pot?
一张长31.4厘米，宽15厘米的长方形商标纸，正好把一个高15厘米的圆柱形茶叶罐的侧面圆柱，做这样的一个茶叶罐至少需要多少平方厘米的纸板？
<gadget id="calculator">157 + 47.1</gadget>
<output>204.1</output>

<result>204.1</result>