Use a piece of cuboid wood with a length of 6 decimeters, a width of 4 decimeters, and a height of 5 decimeters, and cut it into a cylinder with the largest bottom surface. What is the area of the base of this cylinder?
用一块长是6分米，宽是4分米，高是5分米的长方体木料，削成一个底面最大的圆柱．这个圆柱的底面积是多少？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

<gadget id="calculator">3.14 * (25/4)</gadget>
<output>19.625</output>

<result>19.625</result>