From two 4 cm and two 9 cm long sticks, choose 3 sticks to form an isosceles triangle, what is the perimeter of the formed isosceles triangle in cm?
从两根4厘米和两根9厘米长的小棒中，选出3根围成一个等腰三角形，围成的等腰三角形的周长是多少厘米．
<gadget id="calculator">9 + 9 + 4</gadget>
<output>22</output>

<result>22</result>