Current location - Training Enrollment Network - Mathematics courses - Kneel for seven times the answer of the mathematics experimental class of Su Ke Edition.
Kneel for seven times the answer of the mathematics experimental class of Su Ke Edition.
1, (1) is CD AC parity (2)3 1 degree.

2. Parallel isosceles angles are equal and two straight lines are parallel.

3, FG, EC are isomorphic angles FG EC.

4、C

5. A.

6、D

7、C

8. solution: AB∑CD

∫≈ 1 = 127 degrees

∴∠EFB= 180 degrees-127 degrees =53 degrees.

∫∠2 = 53 degrees

∴∠FEB=∠2

∴AB∥ CD

9. Solution: MQ∑NP

∠∠BME =∠DNE

∴AB∥CD (same angle, two parallel straight lines)

∫≈ 1 =∠2

∴ ∠EMQ=∠MNP

∴MQ∥NP (same angle, two parallel lines)

10, solution: AB∨CD

∠∠2 =∠EHD

∠ 1=∠2

∴∠ 1=∠EHD (equivalent substitution)

∴AB∥CD (two parallel lines at the same angle)

1 1, (1) solution: EF∑BD

∠∠ADE = 60 degrees, ∠ 1=∠ 2.

∴∠ 1=∠2=30 degree

∫∠3 = 30 degrees.

∴∠ 1=∠3

∴EF∥ BD

(2) Solution: When ∠ABC=∠ AED, that is ∠ABC=60 degrees, DE∨BD.

12、D

13、B

14, parallel

I have