The side length of a square is its perimeter ((())/(())), if the square's perimeter is 8 cm, its side length is how many centimeters.
正方形的边长是它周长的((())/(()))，如果正方形的周长是8厘米，它的边长就是多少厘米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">8 * (1/4)</gadget>
<output>2</output>

<result>2</result>