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People's Education Edition, Grade Seven, Volume Two, Mathematics Exercise Book, Chapter Five, Class Intersection Line 1 Answer
Answer: [knowledge combing] 1, male * * * side extension line

2, the vertex angles are equal

[homework] 1, d

2、C

3、? Freedom? AOF? BOE

4、( 1) 50 130 (2) 20

5. Can you tell from the isocenter angle? DOB=? AOC=28? .

Because? DOE=? Dobby, so? DOE=28? .

Because? AOC+? AOE+? DOE= 180? ,

So what? AOE= 124? .

Because we broke up again? AOE, so? EOF= 1/2AOE=62?

[homework] 6, c

7、C

8、 144?

9、 190? 230?

10、 ( 1) 40?

(2) 60?

1 1、 150?

12, the vertex angles are equal from the opposite side, okay? DOB=? AOC= 36? .

Because? DOE:? DOB=5:2, which can be set? DOE= 5x,? DOB=2x,

So 2x=36? , so? = 18? .

So what? BOE=? Is it? DOB=3x=54? .

So what? AOE= 180? -? BOE= 126? 1

13, because oc is divided equally? EOG, so? ECC=? Gulf Cooperation Council.

Because? ACG=? Enemy, so? ACG+? GCC=? FOE+? ECC。

So what? AOC-? FOC again. for what? BOD= 56? ,

So what? FOC=? AOC=? BOD=56?