If the side length of a square is (3/7) meters, what is its perimeter in meters?
一个正方形的边长是(3/7)米，它的周长是多少米．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) * 4</gadget>
<output>12/7 = around 1.714286</output>

<result>12/7 = around 1.714286</result>