Build the largest circular lawn on a square space with a side length of 8 meters, and plant small trees around the lawn at intervals of 1.57 meters. How many small trees can be planted in total?
在边长为8米的正方形空地上建一个最大的圆形草坪，在草坪的周围种上小树，每隔1.57米种一棵，一共可以种多少棵小树？
<gadget id="calculator">8 / 1.57</gadget>
<output>5.095541</output>

<gadget id="calculator">3.14 * 5.095541</gadget>
<output>15.999999</output>

<result>15.999999</result>