1、50

2、B

3.( 1) Two straight lines are parallel and have the same angle. ∠B (2)∠5。 Internal dislocation angles are equal and two straight lines are parallel. (3)∠BCD. The internal angles on the same side are complementary and the two straight lines are parallel. laser record

4、90、60

5. solution: the straight line AB is parallel to CD. The reasons are as follows: ∫≈ 1+∠3 = 180, ∴∠ 3 = 180-∠ 1 = 72, because ∠.

6. Solution: ∫ab∨df, ∴∠ EGB = ∠ D = 1 15, ∫eg b+∠dgb = 180.

It is too late. .

7.①∫ab∨DC (known) ∴∠ A+∠ D = 180 (complementary angle of two parallel lines with internal angles) ②∫ad∨BC (known) ∴∠.

8. Don't forget to write this: just ... as shown in the picture.

9. Solution: ∵BE bisector ∠ABC (known), ∴1= ∠ EBC (definition of bisector) ∵1= ∠ 2 (known).

10, (1)∵de∑ab (known), ∴∠ 4+∠ n = 180 (two lines are parallel and complementary), ∵ af.

(2)∫ed∨ab, ∴∠ 4+∠ n = 180 (complementary angles of two parallel lines with internal angles), ∫rn∨af, ∴∠6+∞

Finally finished. I've tried. I hope to adopt. . There is no problem with your homework. You have passed both exams, including this unit. 100 ~ I wish you progress in your study.