The base of an isosceles triangle is 3 cm and its perimeter is 37 cm. What is its waist length in cm?
一个等腰三角形的底边是3厘米，周长是37厘米，它的腰长是多少厘米？
<gadget id="calculator">37 - 3</gadget>
<output>34</output>

<gadget id="calculator">34 / 2</gadget>
<output>17</output>

<result>17</result>