Uncle Li surrounded a square with a side length of 10 centimeters with a wire. If this wire is used to form an isosceles triangle whose base is 12 cm, what is the length of the waist in cm?
李伯伯用一根铁丝围成了一条边长是10厘米的正方形．如果用这根铁丝围成一个底边是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>