Lines L and M are parallel. Determine which of the lettered angles are vertical angles.

Lines L and M are parallel. Determine which of the lettered angles are vertical angles.LMdfghrstuvw
Identify the problem solving method that should be used. Choose the correct answer below.

A.
The Three-Way Principle
B.
The Counterexample Principle
C.
The Analogies Principle
D.
The Splitting-Hairs Principle

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