To make 10 sections of cylindrical iron sheet ventilation pipes, each section is 1.5 meters long, and the circumference of the bottom surface is 30 cm. How many square meters of iron sheets are needed at least?
做10节圆柱形铁皮通风管，每节长1.5米，底面周长30厘米，至少需要铁皮多少平方米？
<gadget id="calculator">1.5 * 100</gadget>
<output>150</output>

<gadget id="calculator">30 * 150 * 10</gadget>
<output>45_000</output>

<result>45_000</result>