Once it rained heavily, Teacher Yang put a cylindrical plastic bucket outside. After a while, 4 liters of water are filled, and the water depth in the bucket is 2dm. What is the bottom area of the bucket?
有一次下大雨，杨老师将一个圆柱形的塑料桶放在室外．不一会儿，就装了4升水，桶中水深2dm，求桶的底面积有多大？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>