The base of a cuboid is a square, and the sides are also a square. It is known that the perimeter of the base is 20 cm. What is the volume of the cuboid in cubic centimeters?
一个长方体的底面是正方形，侧面展开也是一个正方形，已知底面的周长是20cm，这个长方体的体积是多少立方厘米？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 20</gadget>
<output>500</output>

<result>500</result>