cuboid glass fish tank without a cover has a length and width of 4 decimeters and a height of 4.5 decimeters. What is the size of the space occupied by this fish tank?
一个无盖的长方体玻璃鱼缸，长和宽都是4分米，高是4.5分米，这个鱼缸所占空间的大小是多少？
<gadget id="calculator">16 * 4.5</gadget>
<output>72</output>

<result>72</result>