If one side of an isosceles triangle is 9 cm long and the other side is 4 cm long, what is its perimeter in cm?
一个等腰三角形的一条边长9厘米，另一条边长4厘米，它的周长是多少厘米．
<gadget id="calculator">9 + 9 + 4</gadget>
<output>22</output>

<result>22</result>