The sum of the lengths of two adjacent sides of a parallelogram is 56 cm. What is the perimeter of the parallelogram?
一个平行四边形两条相邻的边长的和是56厘米，这个平行四边形的周长是多少？
<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<result>112</result>