Disassemble a rectangle whose length is 8 meters and whose width is 2 meters, and bend it into a square again. What is the side length of this square?
把一个长方形的长是8米，宽是2米拆开，重新弯成一个正方形，这个正方形的边长是多少米？
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

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

<gadget id="calculator">10 * (1/2)</gadget>
<output>5</output>

<result>5</result>