A square flower bed with a side length of 6 meters should be surrounded by a fence. How long is the fence?
一块正方形的花坛，边长是6米，要在它的四周围一圈栅栏，栅栏长多少米？
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>