A square is surrounded by a wire long (4/7) meters, what is the area of the square in square meters
用一根长(4/7)米的铁丝围成一个正方形，这个正方形的面积是多少平方米
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) / 4</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) * (1/7)</gadget>
<output>1/49 = around 0.020408</output>

<result>1/49 = around 0.020408</result>