Put a pot of flowers every 1.57 meters beside a circular pool with a diameter of 4 meters, how many pots can be placed in total.
在直径是4米的圆形水池边每隔1.57米放一盆花，一共可以放多少盆．
<gadget id="calculator">4 / 1.57</gadget>
<output>2.547771</output>

<gadget id="calculator">3.14 * 2.547771</gadget>
<output>8.000001</output>

<result>8.000001</result>