Make a cube glass water tank (without cover) with side length 0.7m. What is the minimum square meter of glass needed to make this sink?
做一个正方体玻璃水槽(无盖)，棱长0.7m．制作这个水槽至少需要玻璃多少平方米？
<gadget id="calculator">0.7 * 0.7 * 5</gadget>
<output>2.45</output>

<result>2.45</result>