A cylindrical chimney with a base radius of 10 cm and a height of 95 cm. To make a section of such a chimney, at least how many square centimeters of iron sheet is needed. (neglected at joints)
一种圆柱形状的烟囱，底面半径10厘米，高95厘米．做一节这样的烟囱，至少需要多少平方厘米的铁皮．(接头处忽略不计)
<gadget id="calculator">2 * 3.14 * 10 * 95</gadget>
<output>5_966</output>

<result>5_966</result>