A cylinder has the same volume as a cuboid with a length of 18 decimeters, a width of 5 decimeters, and a height of 3 decimeters. If the height of the cylinder is 9 decimeters, what is the area of its base in square decimeters?
一个圆柱与一个长为18分米，宽5分米，高3分米的长方体体积相等．如果圆柱的高是9分米，它的底面积是多少平方分米．
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 * 5 * (1/3)</gadget>
<output>30</output>

<result>30</result>