A square is surrounded by a wire long (8/9) m, what is the side length of this square?
用一根长(8/9)米的铁丝围成一个正方形，这个正方形的边长是多少？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(8/9) / 4</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>