Plant a flower every 1.57 meters around a circular flower bed with a diameter of 5 meters, how many flowers can be planted in total.
在直径5米的圆形花坛的周围每隔1.57米栽一棵花，一共可以栽多少棵．
<gadget id="calculator">5 / 1.57</gadget>
<output>3.184713</output>

<gadget id="calculator">3.14 * 3.184713</gadget>
<output>9.999999</output>

<result>9.999999</result>