A rectangular parallelepiped with a square base is expanded to obtain a square with a side length of 60 cm. What is the volume of the rectangular parallelepiped?
一个底面为正方形的长方体，侧面展开后得到边长为60厘米的正方形，这个长方体的体积是多少？
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 15 * 60</gadget>
<output>13_500</output>

<result>13_500</result>