Use 36 centimeters of iron wire to surround a triangle. Among all the triangles formed, the length of the longest side must be less than how many centimeters.
用36厘米的铁丝去围三角形，在围成的所有三角形中，最长的一条边的长度要小于多少厘米．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<result>18</result>