To make a cuboid goldfish tank without a cover, the length and width are 0.6 meters, and the height is 0.4 meters. At least how many square meters of glass is needed.
做一个无盖的长方体金鱼缸，长和宽都是0.6米，高是0.4米，至少要玻璃多少平方米．
<gadget id="calculator">0.6 * 0.6</gadget>
<output>0.36</output>

<gadget id="calculator">0.6 * 0.4</gadget>
<output>0.24</output>

<gadget id="calculator">0.24 + 0.24</gadget>
<output>0.48</output>

<gadget id="calculator">0.48 * 2</gadget>
<output>0.96</output>

<gadget id="calculator">0.36 + 0.96</gadget>
<output>1.32</output>

<result>1.32</result>