An isosceles triangle has a base of 3 cm and a perimeter of 37 cm. What is its waist?
一个等腰三角形的底边是3厘米，周长为37厘米．它的一条腰是多少？
<gadget id="calculator">37 - 3</gadget>
<output>34</output>

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

<result>17</result>