Uncle Li wants to use a fence to surround a small vegetable field with a side length of 8 meters. How many meters long does the fence need?
李大爷要靠墙用篱笆围一个边长是8米的正方形小菜地，需要多少米长的篱笆？
<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>