A circular square has a diameter of 20m. It is planned to place a flower pot every 0.4m along the sideline of the square, how many flower pots are needed.
一个圆形广场的直径为20m．计划沿广场边线每隔0.4m放一个花盆，需要多少个花盆．
<gadget id="calculator">20 / 0.4</gadget>
<output>50</output>

<gadget id="calculator">3.14 * 50</gadget>
<output>157</output>

<result>157</result>