Make a cylindrical tea canister with iron sheet, the diameter of the bottom surface is 10 cm, and the height is 15 cm. How many square centimeters of iron sheet should be used to make this tea canister? (Use the "one-up method" to get the value, and keep the result to ten square centimeters)
用铁皮做一个圆柱形茶叶筒，底面直径是10厘米，高是15厘米，制作这个茶叶筒至少要用铁皮多少平方厘米？(用"进一法"取值，得数保留到十平方厘米)
<gadget id="calculator">3.14 * 10 * 15</gadget>
<output>471</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<gadget id="calculator">471 + 157</gadget>
<output>628</output>

<result>628</result>