The perimeter of a square piece of paper is (8/13) meters, what is its area?
一张正方形纸的周长是(8/13)米，它的面积是多少．
<gadget id="calculator">8 / 13</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(8/13) / 4</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">(2/13) * (2/13)</gadget>
<output>4/169 = around 0.023669</output>

<result>4/169 = around 0.023669</result>