Xiaoqing inserts a 6.5-meter-long bamboo pole vertically into the pool (to the bottom of the bamboo pole), makes a mark A at the junction of the bamboo pole and the water surface, then pulls out the bamboo pole and inserts the other end vertically into the water (to the bottom of the bamboo pole). Make a mark B at the junction of the water surface. It is known that the distance between A and B is 0.5 meters. How deep is the water in the pool?
小青将一根6.5米长的竹竿垂直插入水池中(竹竿到底)，在竹竿与水面交界处作一记号A，然后把竹竿拔出来用另一头再垂直插入水中(竹竿到底)，在竹竿与水面交界处作一记号B，已知AB两点距离是0.5米，水池中水深多少米？
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>