The value of x is 20. This is because vertical angles are equal, so you can set the two expressions equal to each other (4x=80) and solve for x by dividing both sides by 4.
Two vertical angles measure 80° and 4x how many degrees are there in x?
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Question context
This question is part of 📐 Geometry within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.