An isosceles triangle vegetable field, the bottom side is 12 meters long and 2 meters shorter than the waist, find the perimeter of this vegetable field.
一块等腰三角形菜地，底边长12米，比腰短2米，求这块菜地的周长．
<gadget id="calculator">12 + 2</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">28 + 12</gadget>
<output>40</output>

<result>40</result>