circular flower bed is surrounded by pots of flowers at intervals of 1 meter. There are 20 pots of flowers in total. What is the circumference of the flower bed in meters?
一个圆形花坛周围每隔1米摆一盆鲜花，一共摆了20盆鲜花，花坛的周长是多少米．
<gadget id="calculator">20 * 1</gadget>
<output>20</output>

<result>20</result>