bamboo pole is 3.2 meters long, inserted vertically into the pond, the part that enters the mud is 1.02 meters long, and the part that is out of the water is 0.89 meters. How deep is the pond?
一根竹竿长3.2米，垂直插入水塘中，入泥部分长1.02米，露出水面的部分0.89米．池塘水深多少米？
<gadget id="calculator">3.2 - 1.02 - 0.89</gadget>
<output>1.29</output>

<result>1.29</result>