A cuboid fish tank (length 1.5m without cover, width 0.4m, height 0.8m), at least how many square meters of glass is needed to make this fish tank?
一个长方体鱼缸(无盖长1.5m，宽0.4m，高0.8m)，制作这个鱼缸至少要多少平方米玻璃？
<gadget id="calculator">1.5 * 0.4</gadget>
<output>0.6</output>

<gadget id="calculator">1.5 * 0.8 * 2</gadget>
<output>2.4</output>

<gadget id="calculator">0.4 * 0.8 * 2</gadget>
<output>0.64</output>

<gadget id="calculator">0.6 + 2.4 + 0.64</gadget>
<output>3.64</output>

<result>3.64</result>