A side of an equilateral triangle is 25 meters long. How long would it take to have a fence around it?
一个等边三角形的一条边长25米．要在它周围围一圈篱笆，需要多长的篱笆？
<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<result>75</result>