A square handkerchief has an area of (1/25) square meters. Now it is necessary to put lace around the handkerchief. What is the length of the lace?
一块正方形的手帕，面积是(1/25)平方米，现在要给手帕的四周安上花边，则花边的长是多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 4</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>