Angle Relationships & Triangles Assessment

1. What is the sum of interior angles of a triangle?

2. Which set of angle measures could be the interior angles of a triangle?

3. If two of the angles of a triangle are 30 and 70 degrees, the third angle measures...

4. What is the measure of the missing angle?

5. Find x.

6. Which equation could be used to find the value of x in the triangle below?

7. Which of the following angles can you add together to equal angle d?

8. What is the value of the missing angle?

9. Find the missing angle x°.

_{The figure is not drawn to scale}.

10. Find the missing angle TSR.

11. If the two triangles are similar, what is <F ?

12. In triangle ABC, m∠A = 40° and m∠B = 80°. Which of the following triangles is similar to triangle ABC?

13. Which proportion could be used to find the missing side length, x?

14. Find  $m\angle1.$  

15. Find  $m\angle2.$  

16. Lines r and s are cut by a transversal. What value of x proves r ∥ s?

17. We assume that, since the lines are parallel, Corresponding Angles are congruent - for example  $\angle5\cong\angle1$  .  Check THREE boxes with Corresponding Angles.

18. Which equation would you use?

20. Lines A and B are parallel lines. Find the measures of angles 3.