40 trees are planted around the circular pool, and the distance between every two trees is 1.57 meters. What is the area of the pool?
圆形水池的四周种了40棵树，每两棵的距离是1.57米，问水池占地面积是多少？
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">40 / 6.28</gadget>
<output>6.369427</output>

<gadget id="calculator">1.57 * 6.369427</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>