A circular field has a radius of 50 meters. If you want to place a potted flower every 2 meters around it, how many potted flowers should you place in total?
一个圆形场地，它的半径是50米，要在它的周围每隔2米摆1盆花，一共要摆多少盆花？
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">2 * 3.14 * 25</gadget>
<output>157</output>

<result>157</result>