A 50 cm long rope is used to form an isosceles triangle with a base length of 12 cm. What is the length of the waist of the isosceles triangle in cm?
用一根长50厘米长的绳子围成一个等腰三角形，底长12厘米，等腰三角形的腰长是多少厘米？
<gadget id="calculator">50 - 12</gadget>
<output>38</output>

<gadget id="calculator">38 / 2</gadget>
<output>19</output>

<result>19</result>