Theory
Exercises
1. 
Lines on the plane
Difficulty: easy 
1

2. 
Questions on the properties of angles formed at the intersection of two parallel lines
Difficulty: easy 
1

3. 
Parallel lines  rectangle
Difficulty: easy 
1

4. 
Parallel lines  cube edges
Difficulty: medium 
1

5. 
Parallel lines  hexagon
Difficulty: medium 
1

6. 
Parallel lines, corresponding angles
Difficulty: medium 
1

7. 
180 degrees angles
Difficulty: medium 
1

8. 
Calculations using the parallel lines property
Difficulty: hard 
4

9. 
Corresponding angles
Difficulty: hard 
3

10. 
Crosswise lying corners, vertical or adjacent corners
Difficulty: easy 
2

11. 
Crosswise lying corners, corresponding and vertical angles
Difficulty: easy 
1

Tests
1. 
Training test
Difficulty: medium 
6
