A circular garden has a diameter of 100 meters. Plant a rhododendron about every 2 meters along its edge, how many trees will be planted in total.
一个圆形花圃的直径是100米．沿着它的边线大约每隔2米种一棵杜鹃花，-共要种植多少棵．
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

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

<result>157</result>