What is the perimeter of an isosceles triangle that is 4 cm long and 9 cm long on the other side?
一个等腰三角形一边长4厘米，一边长9厘米，它的周长是多少厘米．
<gadget id="calculator">9 + 9 + 4</gadget>
<output>22</output>

<result>22</result>