A physical education teacher uses a 6-meter-long rope to draw a circle on the ground around a wooden stake. What is the diameter of the circle in meters?
体育教师用一根长6米的绳子绕着一根木桩在地上画圆，这个圆的直径是多少米．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>