Each side of a square flowerbed is 8 meters long, and railings are placed around the flowerbed, how many meters of railings are needed?
正方形的花圃每条边长8米，在花圃四周围上栏杆，那么需要多少米的栏杆？
<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<result>32</result>