The side length of an equilateral triangle vegetable field is 20 meters. How many meters of fence is needed to enclose this vegetable field?
等边三角形菜地的边长是20米，要将这个菜地围上篱笆，需要篱笆多少米？
<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<result>60</result>