1. Find the value of unknown x in the following figure:

2. Find the value of unknown x in the following figure:

3. Find angle x in the following figure:

4. Find angle x in the following figure:
Hint: x = 50°.

5. Find angle x in the following figure:

6. Find angle x in the following figure:

7. Find angle x in the following figure:

8. Find angle x in the following figure:

9. In which case of the following lengths of sides of a triangle, is it possible to draw a triangle?

10. Which of the following cannot be the sides of a right triangle?