1:
⑴ 圆 侧
⑵ 25.12 50.24 150.72 251.2 301.44 100.48
2:
⑴ C
⑵ B {零五网小提示:侧面也是一个面哦!}
⑶ C
⑷ A
⑸ C A
3:
圆柱表面积
5÷2=2.5
3.14x2.5x2+3.14x5x3
=3.14x6.25x2+3.14x5x3
=39.25+47.1
=86.35(平方厘米)
体积
3.14x2.5x3
=3.14x6.25x3
=58.875(立方厘米)
圆锥
3.14x6x6÷3
=3.14x36x6÷3
=226.08(立方厘米)
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