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Theory
Exercises
1. 
Pick the suitable choice
Difficulty: easy 
2

2. 
Select the set of angles that forms a triangle
Difficulty: easy 
3

3. 
Find the unknown angle if other two angles are given
Difficulty: easy 
3

4. 
Determine the unknown angle in the right triangle
Difficulty: medium 
3

5. 
Evaluate the unknown equal angles in isosceles triangle
Difficulty: medium 
4

6. 
Calculate the unknown outiside angle
Difficulty: medium 
4

7. 
Find two unknown angles using two known angles
Difficulty: medium 
4

8. 
Solve and get the unknown angles
Difficulty: hard 
5

9. 
Find exterior angle of a triangle from known interior angles
Difficulty: hard 
5

10. 
Determine unknown angle from opposite triangle
Difficulty: hard 
5

Tests
1. 
Training Test
Difficulty: medium 
9
