Build a circular flower pond with a diameter of 16 meters. Xiaohong walked around it 5 times. How many meters did Xiaohong walk in total?
修建一个直径是16米的圆形花池，小红围绕它走了5圈，小红一共走了多少米？
<gadget id="calculator">3.14 * 16 * 5</gadget>
<output>251.2</output>

<result>251.2</result>