The perimeter of a square pool is equal to the perimeter of a rectangular pool. This rectangular pool is 9 meters long and 7 meters wide. What is the side length of this square pool?
一个正方形水池的周长和一个长方形水池的周长相等，这个长方形水池长是9米，宽是7米，这个正方形水池的边长是多少米？
<gadget id="calculator">9 + 7</gadget>
<output>16</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">16 * (1/2)</gadget>
<output>8</output>

<result>8</result>