In the physical education class, the teacher drew a circle on the bottom with a 6-meter-long rope and a wooden stake. What is the circumference of this circle in meters?
体育课上老师用一根长6米的绳子恰好饶着一根木桩在底上画了一个圆，这个圆的周长是多少米．
<gadget id="calculator">3.14 * 2 * 6</gadget>
<output>37.68</output>

<result>37.68</result>