If the lengths of two adjacent sides of a parallelogram are 42 cm and 24 cm respectively, what is the perimeter in cm?
一个平行四边形两条相邻的边长分别是42厘米和24厘米，那么周长是多少厘米．
<gadget id="calculator">42 + 24</gadget>
<output>66</output>

<gadget id="calculator">66 * 2</gadget>
<output>132</output>

<result>132</result>