Answer:
Name triangles in order using corresponding sides and angles. If possible, name them in alphabetical order.
Name the theorem by the order the corresponding congruent pieces appear.
Explanation:
Naming triangles can be done in any order, however, normally they are named alphabetically when possible and in the order of corresponding sides/angles.
For number 2b, should be named Triangle ABC and Triangle ABD since angles CAB and BAD have the same symbol.
To name the theorem, trace the triangle. As you encounter a congruent piece label it A for angle or S for side. For 2b, it is A -S - A known as ASA.