Make 5 sections of metal ventilation pipes, each section is 1.2m long, and the cross-sectional diameter is 10cm. How many square meters of iron sheets are needed to make these ventilation pipes?
做5节铁皮通风管，每节长1.2m，横截面直径是10cm，做这些通风管至少需要多少平方米铁皮？
<gadget id="calculator">3.14 * 0.1 * 1.2</gadget>
<output>0.3768</output>

<gadget id="calculator">0.3768 * 5</gadget>
<output>1.884</output>

<result>1.884</result>