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相 交 线 中 的 角 - PowerPoint PPT Presentation

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相 交 线 中 的 角

“三线八角”

1. 用语言表述右图.

b

a

l

1.角的概念:

2.两条相交直线形成___个角,这些角有哪些关系?

2. 两条直线相交可以得到四个角,那么两条直线被另一条直

8

3.例题

∠BAE和∠DCF是内错角( )

×

×

∠3的同旁内角是___________,

∠2的内错角是_____________.

(1)∠B和∠DAB,它们是直线DE、BC被直线_____所截而成的,称它们为_____角;

(2)∠B和∠CAB,它们是直线_____、_____被直线AB所截而成的,称它们为______角;

(3)∠C和∠DAC,它们是直线____、_____被直线_____所截而成的,称它们为同旁内角.

AB

AC

BC

DE

BC

AC

∠1、∠3

∠2、∠5

∠4