There is a 1 meter square piece of wood whose cross-section is a square with a perimeter of 40 cm. What is the volume of this square piece of wood in cubic decimeters?
有一段方形木头1米，其横截面是周长40厘米的正方形，这段方木的体积是多少立方分米？
<gadget id="calculator">40 / 1</gadget>
<output>40</output>

<gadget id="calculator">40 * 10</gadget>
<output>400</output>

<gadget id="calculator">400 / 400</gadget>
<output>1</output>

<gadget id="calculator">1 * 1 * 1 * 10</gadget>
<output>10</output>

<result>10</result>