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同学们我们开始上课了 - PowerPoint PPT Presentation

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D上图中广场中心的边缘是一个五边形，你能设法求出它的五个内角的和吗？小明是这样做的

C

E

B

A

1 从顶点A可以画几条对角线？

2 这样五边形被分成了几个三角形？

3 五边形的内角和是多少度？

A上图中广场中心的边缘是一个五边形，你能设法求出它的五个内角的和吗？小明是这样做的

B

C

D

O

E

D

E

A

O

C

B

A

A

E

B

B

C

C

D

E

D

A

P

E

D

C

B

C

A

F

B

E

4

C

D

4×180°

4

n-2

5

3

(n-2) ×180°

900 °

540 °

720 °

12边形内角和是_______

• 设计一个实验，说明四边形内角和是360°