What type of angles are labeled and what is the value of m? Show your work.

[SOLVED] What type of angles are labeled and what is the value of m? Show your work.
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Answer:see explanationStep-by-step explanation:m + 20 and 100 are vertically opposite angles and are congruent , thenm + 20 = 100 ( subtract 20 from both sides )m = 80