There is a cylindrical container and a conical container, their heights are equal, the radius of the bottom surface of the conical container is 3 decimeters, the diameter of the bottom surface of the cylindrical container is 4 decimeters, the conical container is filled with water first, and then the water Pour all the water into a cylindrical container. At this time, the water depth is 1 decimeter lower than (4/5) the height of the container. What is the volume of the cylindrical container?
有一个圆柱形容器与一个圆锥形容器，它们的高相等，圆锥形容器的底面半径是3分米，圆柱形容器的底面直径是4分米，先将圆锥形容器灌满水，再把水全部倒入圆柱形容器中，这时水深比容器的高度的(4/5)低1分米，求圆柱形容器的容积是多少？
<gadget id="calculator">80 / 49</gadget>
<output>80/49 = around 1.632653</output>

<gadget id="calculator">4 * 4 * (80/49)</gadget>
<output>1_280/49 = around 26.122449</output>

<result>1_280/49 = around 26.122449</result>