Use 18 cm wire to form a triangle, and the length of the longest side in the formed triangle must be less than how many centimeters.
用18厘米的铁丝围成一个三角形，在围成的三角形中最长的一条边的长度要小于多少厘米．
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>