A rectangular parallelepiped frame is made of a 36 cm long iron wire, what is the sum of the lengths of the three edges intersecting at a vertex in cm.
用一根长36厘米的铁丝做成一个长方体框架，相交于一个顶点的三条棱的长度之和是多少厘米．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<result>9</result>