If the perimeter of a square is (4/9) meters, what is its area in square meters?
一个正方形的周长是(4/9)米，则它的面积是多少平方米．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) / 4</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) * (1/9)</gadget>
<output>1/81 = around 0.012346</output>

<result>1/81 = around 0.012346</result>