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# 圆柱的表面积 - PowerPoint PPT Presentation

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１．圆柱由哪几部分组成？

２．圆柱的表面积指的什么？

+圆柱的侧面积

S表面积=2πr×h + 2×πr2

5

15

15

2 ×3.14 ×5

5

2×3.14×5×15

=471(平方厘米）

3.14×52

=78.5(平方厘米）

471+78.5×2

=628(平方厘米）

（1）帽子的侧面积：

＝1758.4（cm2）

3.14×20×28

（2）帽顶的面积：

3.14×（20÷2）2

＝314（cm2）

（3）需要用面料：

＝2072.4

1758.4＋314

≈2073（cm2）

2073