A triangular wheat field has three sides whose lengths are 30 meters, 40 meters and 50 meters respectively, what is its perimeter in meters?
一块三角形麦地，三边的长分别是30米、40米、50米，它的周长是多少米．
<gadget id="calculator">30 + 40 + 50</gadget>
<output>120</output>

<result>120</result>