A rectangular parallelepiped with a height of 5 cm has an open side area of 1 square decimeter. What is the perimeter of the bottom of the rectangular parallelepiped?
将一个高5厘米的长方体，打开侧面的面积是1平方分米，这个长方体底面周长是多少．
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">1 * 20</gadget>
<output>20</output>

<result>20</result>