A cuboid with a square base, its base perimeter is 20 cm, and its height is 4 cm, what is the volume of this cuboid?
一个底面是正方形的长方体、它的底面周长是20厘米，高是4厘米，这个长方体的体积是多少．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 4</gadget>
<output>100</output>

<result>100</result>