The four side lengths of a quadrilateral are 11 cm, 12 cm, 13 cm and 19 cm respectively. What is the perimeter of the quadrilateral in cm?
一个四边形的四条边长分别是11厘米、12厘米、13厘米和19厘米，这个四边形的周长是多少厘米．
<gadget id="calculator">11 + 12 + 13 + 19</gadget>
<output>55</output>

<result>55</result>