A piece of isosceles triangle green space, its perimeter is 185 meters, its waist length is 52 meters, what is the length of its base?
一块等腰三角形的绿地，它的周长是185米，腰长是52米，底边长是多少米？
<gadget id="calculator">52 * 2</gadget>
<output>104</output>

<gadget id="calculator">185 - 104</gadget>
<output>81</output>

<result>81</result>