Theory
Exercises
1. 
Calculate the side AD of triangle ABC
Difficulty: easy 
1

2. 
Determine the side CB of triangle ABC
Difficulty: easy 
3

3. 
Calculate the value of the variable
Difficulty: easy 
3

4. 
Find the length of AE of triangle ABC
Difficulty: easy 
3

5. 
Determine the value of the variable
Difficulty: medium 
4

6. 
Find the side length of the triangle
Difficulty: medium 
4

7. 
Check whether the lines of the triangle are parallel
Difficulty: medium 
4

8. 
Determine the length of PM
Difficulty: medium 
4

9. 
Calculate the length of PT and VQ
Difficulty: medium 
4

10. 
Check whether CD is the bisector of angle C
Difficulty: medium 
4

11. 
Observe the picture and answer the questions
Difficulty: hard 
6

12. 
Determine the height of the small tree
Difficulty: hard 
5

13. 
Calculate the height of the mother
Difficulty: hard 
5

14. 
Verify the trees are parallel
Difficulty: hard 
5

15. 
Prove the theorem
Difficulty: hard 
5

Tests
1. 
Training test I
Difficulty: easy 
9

2. 
Training test II
Difficulty: medium 
11

3. 
Training test III
Difficulty: hard 
12
