A cylindrical ventilation pipe with a length of 15 meters and a cross-sectional radius of 10 cm. To produce 100 such ventilation pipes, how many square meters of iron sheets are needed in total?
一种圆柱形通风管，长15米，横截面口半径是10厘米，生产这种通风管100个，共需铁皮多少平方米？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 * 3.14 * (1/10) * 15 * 100</gadget>
<output>942</output>

<result>942</result>