Xiaopang draws a circle on the ground with an 8-meter-long rope around a wooden stake. What is the diameter of the circle in meters?
小胖用一根长8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">8 * 2</gadget>
<output>16</output>

<result>16</result>