The perimeter of an isosceles triangle is 80 cm and the length of the base is 24 cm. What is the waist length of this triangle?
等腰三角形的周长是80厘米，底边长24厘米，这个三角形的腰长是多少厘米？
<gadget id="calculator">80 - 24</gadget>
<output>56</output>

<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<result>28</result>