If the perimeter of a square is 2 meters, what is the length of its sides?
一个正方形的周长是2米，它的边长是多少分米．
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>