Plant poplar trees around a small circular pond with a radius of 8 meters, and the distance between every two trees is 1.57 meters. How many trees can be planted?
在半径是8米的圆形小池塘四周栽杨树，每两棵树间隔1.57米，可栽多少棵树？
<gadget id="calculator">8 / 1.57</gadget>
<output>5.095541</output>

<gadget id="calculator">2 * 3.14 * 5.095541</gadget>
<output>31.999997</output>

<result>31.999997</result>