Theory
Exercises
1. 
Calculate the exterior angle
Difficulty: easy 
2

2. 
Determine the exterior angle of right triangle
Difficulty: easy 
3

3. 
Evaluate interior and exterior angles of a triangle
Difficulty: medium 
4

4. 
Determine the angle in isosceles triangle
Difficulty: medium 
4

5. 
Evaluate the unknown value
Difficulty: medium 
4

6. 
Calculate the unknown angles
Difficulty: hard 
5

7. 
Estimate the unknown value
Difficulty: hard 
5

Tests
1. 
Training test
Difficulty: medium 
13
