制作一个无盖的圆柱形铁皮桶，高5分米，底面直径是4分米，至少需要多少平方分米的铁皮（得数何留整数），这个水桶的容积是多少升？
3.14×4×5+3.14×（
）2，4 2
=62.8+3.14×4，
=62.8+12.56，
=75.36，
≈76（平方分米）；
3.14×（
）2×5，4 2
=3.14×4×5，
=62.8（立方分米），
62.8立方分米=62.8升．
答：至少需要76平方分米的铁皮，这个水桶的容积是62.8升．
| 选词填空。 | |
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