To make a cube with a side length of 20 cm without a cover, what is the minimum area of glass required?
制作一个棱长为20厘米的正方体无盖玻璃鱼缸，至少需要多大面积的玻璃？
<gadget id="calculator">5 / 1_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">20 * 20 * (1/200)</gadget>
<output>2</output>

<result>2</result>