To make a chimney made of iron sheets, the length is 1.5 meters, the width is 0.8 meters, and the height is 0.4 meters. How many square meters of iron sheets are needed to make such a chimney?
做一种铁皮烟囱，长1.5米，宽0.8米，高0.4米，做这样一个烟囱要用铁皮多少平方米？
<gadget id="calculator">0.8 * 1.5</gadget>
<output>1.2</output>

<gadget id="calculator">0.4 * 1.5</gadget>
<output>0.6</output>

<gadget id="calculator">1.2 + 0.6</gadget>
<output>1.8</output>

<gadget id="calculator">1.8 * 2</gadget>
<output>3.6</output>

<result>3.6</result>