12.2

1: Use words or a sketch to explain each of the ways triangles can be proved congruent (such as SAS).

7: The total of the three angles in a triangle is 180°.

8: Does XY correspond with LN or with MN in the congruent triangle?

9: For each variable, set up an equation with one angle measure equal to its corresponding angles.

12: State that YZ is congruent to WX, and do the same for the other two pairs of corresponding sides.

13: In each triangle, one angle is 90° and one angle is 70°.

21: Identify which three pairs of angles are congruent and which three pairs of sides are congruent.

28: Use one of the congruency theorems.