A piece of iron wire can be used to form a square frame with side length 5 cm. If this wire is used to form a rectangular parallelepiped frame with a length of 4 cm and a width of 2 cm, what is the height of the rectangular parallelepiped frame in cm?
一根铁丝可以围成一个棱长为5厘米的正方体框架，如果用这根铁丝围成一个长4厘米，宽2厘米的长方体框架，这个长方体框架的高是多少厘米．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 - 4 - 2</gadget>
<output>9</output>

<result>9</result>