If the sum of the two adjacent sides of a square is 12 decimeters, what is its perimeter?
一个正方形，相邻的两条边长度之和是12分米，它的周长是多少分米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>