copper block with a side length of 6 decimeters is forged into a rectangular copper block with a bottom surface of 6 decimeters in length and a width of 3 decimeters. How tall is the cuboid copper block?
将一个棱长6分米的正方体铜块，锻造成底面是长6分米、宽3分米的长方体铜块．这个长方体铜块有多少高？
<result>3</result>