If the perimeter of a square is 16 decimeters, what is the length of its side in centimeters?
一个正方形的周长是16分米，它的边长是多少厘米．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<result>40</result>