Use an iron wire with a length of 72 cm to make a rectangular parallelepiped frame with a length of 4 cm and a width of 6 cm. What is the height in cm?
用一根长72cm的铁丝，做一个长4cm，宽6cm的长方体框架，高是多少厘米？
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">18 - 4 - 6</gadget>
<output>8</output>

<result>8</result>