Teacher Chen straightens a square made of iron wire with a side length of 10 cm, and then surrounds an isosceles triangle with a base of 12 cm. What is the waist length in cm?
陈老师将一个用铁丝做成的边长为10厘米的正方形拉直，再围一个底边是12厘米的等腰三角形，腰长是多少厘米？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 12</gadget>
<output>28</output>

<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<result>14</result>