Master Li used iron sheets to make 8 cylindrical ventilation pipes of the same size, with a diameter of 20 cm and a length of each segment of 60 cm. How many square centimeters of iron sheets are needed in total?
李师傅用铁皮做8节同样大小的圆柱形通风管，直径是20厘米，每节长60厘米，一共需要铁皮多少平方厘米？
<gadget id="calculator">3.14 * 20 * 60 * 8</gadget>
<output>30_144</output>

<result>30_144</result>