An isosceles triangle vegetable field has a perimeter of 46 meters and a base of 12 meters. How long is the waist in meters?
一个等腰三角形的菜地，它的周长是46米，底边是12米，腰长多少米？
<gadget id="calculator">46 - 12</gadget>
<output>34</output>

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

<result>17</result>