The base of a cuboid is a square. After unfolding the sides of the cuboid, it can be assembled into a square with a perimeter of 80 cm. Then, what is the volume of the cuboid?
一个长方体底面是一个正方形，把这个长方体侧面展开后，可以拼成一个周长是80厘米的正方形，那么，长方体的体积是多少．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 * 20 * 80</gadget>
<output>32_000</output>

<result>32_000</result>