An equilateral triangle has a perimeter of 12.6 centimeters, what is the length of its side in centimeters?
一个等边三角形，周长是12.6厘米，它的边长是多少厘米．
<gadget id="calculator">12.6 / 3</gadget>
<output>4.2</output>

<result>4.2</result>