If the side length of a square is (3/10) meters, what is its perimeter in meters?
一个正方形的边长是(3/10)米，它的周长是多少米．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * 4</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>